These rude 'average gamers' you speak of are the vocal minority in my experience... Most of us are normal people.
Do normal people exist? Sure. Are they the majority? Uh, no. :) It's not even a close contest.
This is even pretty easy to see. Pick 100 random top youtube videos of these games. Count the amount of racism, what have you going on in voice chat, team chat, whatever.
I say 100 just so one doesn't say "well, it's just these guys". It's everyone.
Is this good enough for whatever bar you are trying to set?
(i'll note you didn't provide a retort to what i suggested, you instead just went to ad-hominem. So i'm going to assume you in fact, have no data that i'm wrong)
Idk, I just don't see what you see. What do you play?