The word "camping" started in the quake days. It meant to wait by certain pickups, and kill anyone else who tried to get that item. Since you were teh only one to get that item, you had an advantage over the other players. This made people mad, and "camping" started to be an insult. Later, when pro gaming started, "camping" evolved into "controlling the map", which was a perfectly legitimate tactic. But for some reason everyone still hates "campers".
Anyway since there are no items to "camp" in this game, what irrates so many in rs is actually sniping, ambushing, or controlling an area. And yes, this does give that player an advantage. I say so what? That means you insult him by calling him a "camping *wussy"? The person who can't handle snipers or ambushes is the *wussy.
So what if someone has less skill and stays in one room the whole match? Who cares? He doesn't want to die anymore than you do. What, you don't want to wait 2 minutes watching him? Then DONT DIE! Instead of telling other people who ambush to get more skill, get more skill YOURSELF so you don't die.