I feel that you were the one to bring up the comparison between athletes and deranged computer nerds as you put it. I'm simply stating that the phenomena of belittling opponents with trash-talk isnt something thats isolated to wow.
Granted, particularly in combat sports, trash talking isn't very uncommon; but are you seriously comparing trash talking in professional sports with being a deranged nerd on some computer game...?
And even in the former, when there's hundreds of thousands or even millions of dollars/euros at stake, creating hype is simply beneficial for both parties and is expected, it's usually just an act for the media as well. There's practically no disrespect whatsoever between fighters who're not getting widespread media coverage.
I don't even need to bring up regular sports... When was the last time you've heard about a professional athlete who went "lol idk how i/we lost he/they is/are "dog"" or generally disrespect other athletes in press conferences or in any public/private forum for that matter?
And for the last paragraph I'm really curious of what you consider "regular" sports? If you're talking about for example fotball, basketball or hocket, I can hear it very often