The most toxic communities I know of are the Genshin community, Payday 2, FFXIV and source games communities in general.
I’m convinced that some of the toxicity is tuned to your own contributions. I’m almost 40 and I still play League 8-10 hours a week.
Almost all of that is tipsy ARAM games, and considering I got my toxicity out years ago I find that, given I’m always positive and having a fun time, I solely run into others that are positive and having a fun time.
People might underestimate how much self sorting that game does based on behavior in their algorithms.