Honestly Playstion, Xbox, and PC all have their own levels of toxicity problems. Nintendo, I never had a toxic meetup yet, but the last online Nintendo game I played was Metroid Prime Hunters on DS in 2007 so...
I think MOBA and the battle royale game genre are more toxic with various types of the trash comments. But these people can be found in many platforms. I have seen this on mobile the most.
GTA are kind of toxic but not as much as in most SJW games where they have kind of trashtalk which is meant to alienate certain people and also the community that I have noticed.