I've actually managed to find a bunch of fandom subs that are really nice (some of them do have toxic moments from time to time). The worst scandal in the subs I visit was an issue with people sexualizing characters who at the time were not older than 15 in-story. The mods very quickly stepped in and were just like "stop doing that". People would be like "hey some of us fans are also minors!" but it's like, but some aren't and don't want to accidentally run into innuendos about minors randomly.

It's weird how some fandom subs are way worse than the others in terms of toxicity. r/gilmoregirls is basically always "UM THIS CHARACTER IS LITERALLY SATAN AND YOU'RE HITLER IF YOU LIKE THEM" which is annoying as hell.