Yes, someone might be a jock, but that's not the only thing they are. Someone might be a blonde, but that doesn't mean they're not smart too. I might like to play Nintendo but that doesn't mean I'm a nerd. Trying to place someone into one stereotype is like trying to push a square block through a round peg. It totally doesn't work, because it doesn't totally fit.
I've been stereotyped as a jock because I played sports. I've been stereotyped as stuck-up because I was shy. We all have been placed into one stereotype or another. The thing I try to remember when I begin to stereotype people is that this isn't the only thing to this person. Or what I see is not necessarily what I'll get. I personally like to surprise people. After I know they've put a label on me, as quiet or sporty or whatever, I slowly begin to show them who I really am. I can be funny. I can be sarcastic. I can be a little dramatic. I can talk about and enjoy things outside of sports. Who knew?!
The great thing about stereotypes is that we can't prevent them from happening, but we can prove them wrong. Not only that we can break out of those stereotypes and show people that we are way too awesome and complex to be summed up in just one word. HOLLA IF YA HEAR ME!!