E-sports are usually made up of armchair commanders, its not a physical sport. It doesn't have a culture based on the alpha member of the pack, like Boxing does. The direct culture in Games and E-sports, is kids hiding behind anonymity and harassing people because they didn't suffer any consequences in the internet, and that carried on to the games.The 90's are behind us now though, and the internet is less anonymous now. There's consequences for your actions, and people are responsible for what they do.
That's not quite true, if you were a dick you would get your lip bust at the lan cafe or if things were desperate get a knife pulled on you in an arcade because you beat some dude and they had no pocket money left.
I suspect that's why the games that have a background like that have better communities to an extent.