The problem is not one of players. Players will always be douchebags. That's the whole point of multiplayer after all, that you get to act like a jerk to real people instead of to emotionless bots, isn't it?
The problem is one of the game itself. A game should ideally be designed so that camping and staying in one place all the time is a really bad idea. Defending an area, ambushing someone, or something like that should be a viable tactic, but that would be because of either the importance of the area, or the surprise of the attack. Someone sitting still in the same place all the time would be pretty easy to pick off in any close to believable situation (or at least easy to avoid if in a really secure location, like a bunker, or something), and weapons would be avaviable for getting the person out. A game should offer those same options. Simple as.
Bonsaik, you miss one point. Language, especially slang is always evolving. It's always changing. Sure, in Doom that's what camping meant. Nowadays it means something else. Just like the word frag.
Going on a rant like that, about such a subject only makes you look arrogant, and a bit full of yourself. And like a bit of a jerk too, especially when you're wrong. No offence, but I'd advice to try to keep a more level and relevant discussion, and check your facts. If everyone but you has a different opinion on what a word means, then perhaps, just perhaps, you are actually the one that is wrong, and perhaps, just perhaps, it would be better to reevaluate your own opinion, especially when it concerns definitions, as to facilitate communications.