There are people that are intolerant of black people or trans people or whatever, but then there are people that are just plain mean.
I used to play League of Legends and enjoyed the social aspects of unranked play; it would be fun to meet people that would show me things about the world or vice versa, but there was the awful problem that it could take forever to queue because they'd often be people who insisted on playing one particular lane. I learned to jungle early on and to be flexible about roles so I'd be part of the solution instead of the problem.
When I got into ranked though it was just awful, people were always blaming me for the team not winning and for any real or imagined screw-up. I liked to play Sona who is mainly a healer but can sometimes trash the players on the other team really good. If I was being successful at this I'd get bitched out by my bottom because I was depriving them of XP that would help their character scale but, from the viewpoint of the team, if their bottom and support are getting trashed, they're getting trashed. If I was playing well people would bitch me out, if I was playing poorly people bitched me out.
I liked the idea of "finding my level" in ranked but I went back to unranked because I couldn't handle the negativity in ranked.
Eventually I got sick of a game that committed me to 30-50 minutes of paying attention to it and it would be unfair to to other players to bail out because my wife or my son or horse lessoners or the neighbors or someone on the phone needed my attention. But seriously, if you could adjust the dynamics of a game to cultivate positive social interactions that would be a very good thing.