Social media self-care includes blocking people who post negative comments about your favorite fictional characters. It’s not petty, it’s not uncalled for, it’s called “I engage with this content to feel better about myself and it makes me feel bad to see this character I identify with called all sorts of bad names.”
You really don’t have to have a reason to block people beyond “seeing their content makes me feel bad and I’m not here to feel bad, I am here to have fun.”
The biggest thing we get wrong about the internet is this idea that blocking someone is a sign of weakness or irrationality.
Sometimes you just don’t like someone’s content and don’t want to interact with them, and that’s fine.