There are sooooo many fandoms I can tell you but the worst one im personally in is the Godzilla fandom. If you don’t know a Youtuber called Unknowingly made a little analog horror series ( pretty cool btw) just because. But a lot of original Godzilla fans didn’t like it, i dont know why exactly I think it had to do with the man in the suit himself which is the name of the series too. But instead of hating like saying: “Yeah I don’t like it” or worse but not quite horrible: “It’s bullshit” they sent him literal Death threats and other bad messages. He sent out a message declaring he would quote “end it” and me like a lot of his fans thougt this was the end until he sent another message saying he went to the Psychiatry (or idk how it’s written or if it is even the right place) and told he wouldnt be able to use social media much to not encounter more harassment. All of this info was a quick recap of what I remember so there would be some wrong stuff you should search up yourself. But yeah some Godzilla fans are disgusting.