Most of these are indeed true but people just won't admit it.
Yes, I am a console gamer as well, but I am still a PC gamer and PC enthusiast.
As far as "elitism" goes, the above poster shows it clearly. "We are the elite, hardcore players" just about sums up the cockiness of most PC gamers.
E-sports - Meh, consoles have sports, too. PC gamers just take it a lot more seriously as if it were their lives. Too seriously, I believe.
Pirates - It happens. Everyone knows it does. People try to deny it or defend themselves, but it is still there. Much higher than any other system for obvious reasons.
Nerds - yeah, a lot of us are and fail to realize it. Reading through most of the comments in the "real life" sections, people suggest ditching all of their friends and not needing anyone else. Just stay home in your basement and you've got it made!
People here are obsessed with graphics and thus the "Can it play Crysis?" meme was born. It's obvious that people here are obsessed with their 32nm e-peens.
More money than sense - Some things are just so unneeded in terms of hardware. Getting an SR-2 build with dual hexacore Xeons and 4 GTX 580's is absolutely stupid for a build dedicated to gaming. I play on an HD 5550 and every game I've played is fine at Medium settings and that's all I need.
MMORPG's - World of Warcraft is the biggest example that everyone thinks of when they think of a PC gamer. People get far too "addicted" to these games and really ruin the reputation for everyone.
Always complaining - Definitely. Countless threads all over the place of just pure complaining. I am not even going to get into this because of how much it is.