Personally, I'd have to disagree with both of your examples.
Beauty and the Geek is not about making fun of geeks, it's about breaking stereotypes. The geeks usually come in thinking "There's nothing I can learn from these bimbos" and by the end of the series, you see them realize that they actually can learn from each other, and it helps them be better-adjusted people. The girls come in thinking "math is hard!" and being totally self-centered... but by the end of the show, they've learned not to just look at the geeks based on physical appearance or social skill, but they see that they're people too. I think this is the closest that reality TV has ever gotten to being useful.
As a geek with a somewhat tenuous grasp on social skills, the Big Bang Theory is hilarious to me. They make geek jokes I can laugh at, they fawn over the girl next door, they play Klingon boggle, it's like hanging out with me and my friends, only a little more absurd. It's something that contains more elements of *my* life than a show like "Friends" does... and I like it for that reason. Last night one of the guys said "I'm not watching the animated Star Wars TV series until I've watched the animated Star Wars Movie. I'd prefer to let George Lucas ruin my childhood memories in the order he prefers." That's not demeaning to geeks, that's funny stuff.
Sure, they can pick on geeks once in a while. But if you can't laugh at yourself...