I don't know how to dance, and I'm not very good at all the social stuff. At least it used to be like that. These kind of dances are a great way of getting better at both. Hell, maybe you even find out you actually like to dance. (I think it's kinda fun now, actually. Though alcohol is usually involved, so that might explain). Who knows, maybe you find a cute girl that likes you?
The only way you can make sure you never learn how to dance, get a girlfrien and stay socially awkward for the rest of your life is by steering away from these kind of opportunities.