I relate to this so much. I browsed the IC board, learning art, and they had this in joke the site was full of crabs. The gist was crabs in a bucket pull each other down like how anons in the site would not stop making pointless nitpicks/attacking others art, wouldn't stop posting artist e-celeb drama, and wouldn't stop posting how everyone should give up because they lack 'talent'. They filled my head with "I don't have to get good at art because I'm better than *them*", "I can only post perfect art or I'm one of the people crabs make fun of", and "If I don't instantly become an art god I should give up". I stopped browsing that place for a year and got rid of those thoughts, along with improving, but sometimes I give in to the urge to revisit that place, which I always regret.
Also anon if it makes you feel better the people who make petty "cringing at teens art" post are rarely good at art themselves. I've seen their redraws of the bad art and it's always worst.