The difference in the examples cited is not sports vs hackers, it's communication in real life vs over the interwebs.
In my experience most hackers are perfectly pleasant in person, happy to help if asked, and not substantially different to how the article describes the skaters.
Conversely, I bet if you look at some skater videos on youtube they would be full of sarcasm and piss-taking (well they would be if youtube comments weren't a massive fail in their own right)
Geeks and nerds more frequently use online media to communicate, but I don't think they are otherwise more predisposed to antosocial behaviour than anyone else.
As a datapoint, my wife uses babycentre a lot, and the disproportionate flamewars you get there are ridiculous. Put those mothers together in a room and I bet they'd be completely pleasant.