A dad has gone viral this week after he wrote a stern note to the "Karen" who forced him to tear down his children's treehouse.

The dad slammed the woman in a note after they lodged a complaint with his homeowner's association...

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Which resulted in him having to take apart the treehouse he had built for his sons.

A picture of the note, signed off with the name Dave, was posted on Reddit where it went viral with people praising the man's defiance.

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"Dave, Fight back. Don't let the Karen win. Take over the HOA and change the rules. Work from inside the system if you must. Don't let the children down. I really really need to know you didn't let this idiot have her way. Let me know if you need help. Dave's of the world UNITE!" one Redditor wrote.

In the note, Dave branded the move as an "act of casual cruelty" as it posed no danger to any-passerby.

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The treehouse was said to have been positioned at least 2 feet from the trail that ran at the back of the mans garden, the New York Post reports.

"Don't worry, you're safe now! Your act of casual cruelty was successful," the note reads.

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"The complaint you lodged against the HOA was heard. They had me take down the small tree fort that I built on this location with my sons during the pandemic. No longer will its presence offend your walk past my house. Please enjoy your stroll free from the sound of my children's play and laughter. They are safely back inside now, watching television I'm sure."

"Enjoy the unobstructed view of my backyard. I will try to keep it up to code."

You can read the full note above.

What do you think about the treehouse being forcefully removed?