DOTA 2 players might be the meanest. The game includes a reminder at the beginning of the match just for regular players to be nice with new players. That tells you a lot about the community (and, of course, the reminder is mostly useless). The match-accepting button gives some information and tells you the way your allies and enemies (in a single grade) normally behave, and pretty often they are in a red color that says “disruptive”. It’s bad. Unhinged chat and sometimes voice chat.

Also, neurodiversity, mental illness, and basic mental health care. People are discovering they are autistic, ADHDers, etc. They’re learning how to prevent depression or how to apply DBT tools (e.g., for emotional regulation, for judging less). It’s amazing.