I grew up with an A mother and being around drunk people (unless I was drunker and didn't notice) would make me angry, it still does. I believe it's a stress response and normal considering my childhood. I'm hyper sensitive around it as well but I've noticed that with time it becomes easier to discern who I can socialize with. Not everyone gets fall down black out pass out drunk but they do tend to hang out in groups so it may seem that "everyone" drinks like that.
I stopped going by what other people said and started listening to how I felt. If someone told me they were fine but I was uncomfortable, I would leave. Most are pretty respectful of how you feel, I don't make a big deal out of it, they express sadness to see me go and that's that. It was nerve wracking at first because all I could think about was what THEY would think but it was a much bigger issue in my head.