It's a matter of good-sportsmanship. A lot of people seem to be under the impression that they can do whatever they want just because it's a game, yet I guarantee that those same individuals wouldn't dare to sign up to play chess or basketball at a hobby club only to insist on doing it 'their way'. No doubt because they know they'd be laughed at, asked to leave and then kicked out onto their behinds.

It's only due to the anonymity of the internet that they're so emboldened. Luckily they're not entirely free of consequences and can be subjected to a kick if necessary.