I'm not really against stereotypes. They are fun.... except when they're not, haha. (I am thinking of one about Asian men and private parts here.)
Some stereotypes, however, are very outdated. Example: "most people who play video games are teenage boys". On the contrary, today the average gamer is 35, and thanks to the Wii and casual Internet games, there are technically more female gamers than males. The stereotype has been around since the 1980's, but that means that now, an entire generation has grown up with video games. It's only a matter of time before games become as mainstream as the film medium. It's already an increasingly common practice for major actors like Patrick Stewart and Martin Sheen to do voice acting for some games.
Another strange, outdated stereotype is the idea that men with hair past the shoulder are hippies. I have a ponytail now, and I don't think I've ever even met a real hippie in my entire life. They probably don't like Texas very much.