The most toxic communities I know of are the Genshin community, Payday 2, FFXIV and source games communities in general.
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.