The most toxic communities I know of are the Genshin community, Payday 2, FFXIV and source games communities in general.
Im just going to say FFXIV in my experience has a very friendly community, one of the nicest ive seen, so i dont fully understand where that comes from.
For me it would probably be Garry’s Mod, as its full of so many edgy teens who constantly say the n word.
I think the FFXIV thing can be very YMMV.
I’ve had super helpful roulettes and really terrible roulettes. When I was raiding, I found various people who were either super toxic or super helpful in DF.
I’ve never played a game that was so all over the place with community as FFXIV.