Caitlyn Jenner has been slammed for her comment on Kendall Jenner's latest Instagram post for one huge reason.

Keep scrolling to see the comment itself and why there's so much backlash...

The Kardashian-Jenner clan aren't hitting the headlines for the best of reasons right now.

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And today's news is certainly no exception.

Caitlyn Jenner was born on October 28, 1949, in Mount Kisco, New York.

Growing up, she had dyslexia and struggled in school but it became instantly clear that she had a talent for sports and excelled in the likes of water skiing, football, basketball and track, to name a few.

Picking up on her talent, her college track coach encouraged her to train for the Olympic decathlon...

In 1972, Jenner placed third in the Olympic trials and tenth at the Munich Games.

She went on to become one of the most beloved athletes of the '70s.

The gold medal-winning track star set a world record in the decathlon at the 1976 Summer Olympics in Montreal, scoring a staggering 8,634 points.

Following her Olympic success, she has remained well and truly in the spotlight.

Through a number of TV appearances and endorsements, Jenner remained in the public eye. From the late '70s to the early '00s, she worked on several tv series and appeared in a handful of TV movies.

But there's another thing Caitlyn is very well known for...

Keeping Up With The Kardashians, of course!

Caitlyn became a huge part Keeping up with the Kardashian's.

She came into Kris' life after the death of her first husband, Robert Kardashian. She had 2 children with Kris (Kendall, and Kylie) and was hastily blended as a significant role model to all the Kardashian sisters.

Of course, we all know about the famous Caitlyn Jenner transformation.

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Jenner initially announced she would be beginning her transition back in 2015 - even launched her own reality show titled I Am Cait, chronicling her journey throughout her transition.

2 years later, in true Kardashian-Jenner fashion, she went public on the cover of Vanity Fair.

She underwent her final operation - the gender-reassignment surgery - in 2017.

And she couldn't be happier.

In her debut Vanity Fair interview as Caitlyn, she explained how liberating it felt to finally be open as a woman: "I have nothing left to hide. I am kind of a free person, a free soul. Up to this point, I would wear, you know, Bruce would wear sweatshirts with hoods on them so paparazzi can’t get pictures and all that kind of crap."

Caitlyn insists that she is a nicer person than ever now she has transitioned.

When asked about sending a full airplane out just to pick up her Mom, Caitlyn explained: "I know. What I told her: 'Isn’t Caitlyn a much better friend?' Bruce, he would never send a plane. No, no, no, what a jerk the guy was, O.K., Caitlyn is like, 'Send the plane. Mom, we’re sending a plane, we’re going to go pick you up and bring you down here.'... It seems like she has a lot more friends than he ever had."

Yet, despite Caitlyn being happier and more popular than ever...

Her transition understandably took its toll on her daughters, Kendall and Kylie. "My dad says it herself sometimes, it's kind of like mourning the loss of someone, because it is," Kendall said in a candid interview about Caitlyn's transition. "My dad is my dad, but he’s not there physically anymore. But she lets me call her dad -- that's the last little piece of dad I've got."

Though Kendall insists that she'd known about Caitlyn's gender identity for years.

"It's an adjustment. It's something you have to get used to. But I've known since I was a kid," Kendall revealed in the same interview. "He never confirmed it to me, but I’ve known for a very long time. It's the same person."

There has been a noticeable strain in Caitlyn's relationship with her daughters.

And Kendall has remained loyal to her mom, Kris, during her parents' feud. “Kendall is loyal to Kris[Jenner] and has very little to do with her dad. The more time that has passed, the more she feels Caitlyn has let her down with the things she has said and with her actions," a source shared with E! News back in 2017.

However, it's been a few years since her transition now...

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Even though they have been through some pretty rough patches, the family seems to have worked things out.

Jenner prides herself on using her celebrity status to spread a positive message of tolerance.

“If there is one thing I do know about my life, it is the power of the spotlight," Jenner said. “Sometimes it gets overwhelming, but with attention comes responsibility," she explained during her EPSY awards speech, in which she received the Arthur Ashe Award for Courage. "As a group, as athletes, how you conduct your lives, what you say, what you do, is absorbed and observed by millions of people, especially young people. I know I’m clear with my responsibility going forward, to tell my story the right way — for me, to keep learning, to do whatever I can to reshape the landscape of how trans issues are viewed, how trans people are treated. And then more broadly to promote a very simple idea: accepting people for who they are. Accepting people’s differences."

She is passionate about paving the way for trans kids.

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"If you want to call me names, make jokes, doubt my intentions, go ahead because the reality is, I can take it. But for the thousands of kids out there coming to terms with being true to who they are, they shouldn’t have to take it."

She's really living her best life.

In fact, the whole family is.

Kylie owns her own incredibly successful beauty empire.

While Kendall is one of the biggest players in the modelling industry.

Kendall has crafted quite an impressive modeling resume...

From Vogue front covers to some of the most coveted fashion shows in the game - she's done it.

Caitlyn is clearly very proud of her girls.

But, when she decided to comment on Kendall's latest post, she was very quickly slammed by fans.

Kendall and Kylie recently collaborated on a range of cosmetics for Kylie's beauty brand.

And of course, the supermodel took to Instagram to share the news with fans.

She uploaded a series of snaps yesterday...

The star donned the makeup collaboration in the pictures. "wearing KENDALL X KYLIE makeup collab and not much else," she wrote.

Obviously Caitlyn wanted to express her pride.

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So, she decided to comment on the Instagram post.

But her comment was instantly slammed.

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With one user branding it as "disgusting."

Many of the replies were filled with comments like this.

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Don't worry, this will all make sense soon...

Of course, at first glance, her comment actually seems very nice.

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She's just supporting her daughter, right?

But there's a huge reason why people aren't impressed.

Kendall and Kylie have been at the center of a huge scandal. Bare with us on this, it'll all make sense soon...

The controversy surrounding the sisters started last week...

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Kylie and her supermodel sister Kendall have a popular fashion line named Kendall + Kylie and the clothes are available at a wide variety of popular retailers including Nordstrom, ASOS, Macy’s, and even Amazon. And this is where things start to get problematic...

Their fashion line is reportedly owned by Global Brands Group.

... who’ve drawn in controversy after refusing to pay its garment suppliers for orders produced in February and March due to the pandemic.

Rick Darling, CEO of Global Brands Group wrote about this in a letter dated March 21, 2020:

“Given the unpredictability of the situation, our retail partners have canceled orders, and existing inventory and product in production may have no sell-through. Consequently, we have no choice but to make the difficult decision to cancel all S/S 2020 orders from all suppliers (without liability)."

So many of these workers now have no income and in a lot of cases, no government assistance due to their immigration status.

However, non-profit organization, “Remake," is lobbying to hold these brands, and the celebrities who profit from them, accountable for this.

Their #PayUp campaign was initially launched in March...

And it demanded brands to honor their contracts and continue to pay their workers.

Now, fans are calling on the celebs themselves - including Kendall and Kylie, to pay up.

Under a tweet Kylie recently posted about a new line of masks on her beauty website, one user replied: “You have billions but you are refusing to pay poor women who make your clothing for minimum wage in Bangladesh. Hope you are taking notice."

Remake also points out those disproportionately affected by the pulled contracts are people of color.

“Our fashion is brought to life by human hands, most of which belong to black and brown women who work 10-12 hour days and live paycheck to paycheck. [The pandemic] has attacked both her life and her livelihood," the organization writes on its website. “Many live in crowded urban dwellings and take congested transportation to get to work. Facing dwindling orders, many factories around the world opened up this month, forcing garment makers to come back to work despite rising infection rates."

But it gets worse...

After being called out, the Kendall + Kylie brand then reportedly threatened to take legal action "Today, we received word from a KENDALL + KYLIE representative that they do not have “current" orders with Global Brands Group and will pursue legal action if we didn’t remove our posts and apologize," Remake wrote on their Instagram.

"Until we receive clear answers from the team that KENDALL + KYLIE have proof they paid garment makers, we will not back down."

"If KENDALL + KYLIE really support women then why threaten legal action against a non-profit for women BY women and disable comments?"

So, people are essentially furious that Caitlyn can publically state how proud she is in spite of everything that's gone on in the last week...

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While it's a bit of a stretch to slam someone for praising their children, it's definitely important to be speaking out about important issues such as the #PayUp campaign, so we can see why some people are frustrated.