You know what, I think you might actually be right. After thinking about it for a while, I came to a conclusion that I should have reached a long time ago:
Every fandom is the worst. Every single one of them. You can't name a single one that doesn't have people who want others to die over silly shit like ships they don't like, drawing a fat character thinner, drawing a dark-skinned character with slightly lighter skin, etc.
Fandom people are fucking insane by default. Every fandom has the worst fucking circlejerk tendencies I've ever seen. Funny thing is that it always seems to be the feel-good shows like Wander Over Yonder and Steven Universe that are full of positive messages, that attract the worst fucking scum on this planet.
I've never realized this before but I cannot name a single fandom I like, even the ones that I'm technically in because I like the shows.
SU and WOY (and likely many others I haven't heard of) drove people to suicide and showed 0 remorse over it, Gravity Falls and Star Vs have those fucking obnoxious waifu wars, Gumball has furfags all over the place (but so does any fandom, really), Samurai Jack has "wahh the ending was bad because Genndy didn't do exactly what I wanted to happen :(" and MLP, Villainous and many other fandoms have a "I can't stop talking about this thing even though nobody gives a shit" epidemic.
There are no good fandoms. They're all terrible.