The most toxic communities I know of are the Genshin community, Payday 2, FFXIV and source games communities in general.
From video gaming to card games and stuff in between, if it’s gaming you can probably discuss it here!
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League of Legends is toxic in the way of people getting too emotionally invested in a game, but Counterstrike (in the old days, pre Source and GO) was toxic in a casually bigoted way almost completely detached from the state of the current match, which I think is worse.