There are some exceptions out there. A solid nine out of ten (estimation) game communities are just horrible. Call of Duty is one of the worse I have ever had the displeasure of playing. Graal Era comes at a very close second, only because no one has pissed me off to the extent of going out of my way to send a quick little rage message. Maybe once. Bungie, on the other hand, had a legendary fanbase and community for Halo on the BNet before it became inactive. The in-game community wasn't too good.

Other communities like followers of TV shows (Narutards, Bronies, Animaniacs, etc) tend to be much more mature and enjoyable to be a part of. I love the brony community. It's refreshing to log onto the /mlp/ boards after some raging on iEra.