Crutch is too harsh, man. And saying it makes people stupid is way too judgmental. I have friends who drink and I don't mind them at all, though I don't drink. I know they drink because it lets them have a good laugh, relax and have fun. But that doesn't mean I have to join in to be their friend or to have fun with them. I personally think the worst possible reason to drink is to be accepted. If you don't want to, don't; if they don't like it, it's their loss.