If you mean by fandoms, then by pure nature there will always be bad eggs. Yet, I would say in terms of gaming fandoms/communities that are the best, Kriby, rarely any toxicity I see in that fandom/community. For the worse, Pokémon or Legenda of Zelda, mostly with Pokémon because people fight over which of the many games are better than each other, when the core formula is the same.