I didn't see that episode of South Park, no, but I still think you're missing the point. Total-immersion roleplayers are not playing the game this way just to make you feel annoyed -- they're just enjoying their own hobby with one another and don't want others to bother them in that. The annoyance you feel is coming from somewhere inside you, your own reaction based on your own choices -- not from their behavior.

That said, you're entitled not to like it if you want. Just don't go around insulting people because their preferences are different from yours.

Oh okay, I misinterpreted you. I thought you were insulting the people too. You have every right to dislike this particular hobby of course, and I can imagine your frustration at having to communicate with someone who doesn't want to go out of character, especially if they're just pretending not to understand what you mean by "spell damage" and "defense rating" or something. It can be hard to get things done.

The best total-immersion roleplayers I know however, are pretty much able to take everything in stride, and talk about most any topic without breaking character. They can't talk about Britney Spears of course, but then in WoW we usually don't have a "need" to talk about things outside of the game that way. If they're good enough at it, they should be able to talk about everything in game from their character's point of view, enough so that it shouldn't bother you too much.

That said, maybe there's something of your meaning I'm missing still. Would you care to tell a horror story of what happened to you?