[krageon]

I think you'll find almost every community of a competitive game eventually turns into a mostly toxic one. I don't really understand why (it seems a little reductionist to say that most people are toxic and therefore as a community grows most of it will tend towards being toxic), but I keep seeing it no matter what kind of game it is (RTS, MOBA, RPG, etc)

[nuclx]

They're dissatisfied with their performance measured by the time they put in. In turn team mates are blamed for hindering their progress in the ranking system.

[wolfgke]

I would even tend to generalize: The strong competitiveness of the game (or other places that are very competitive) is literally an incubator to make people very toxic towards each other.