Eh, I've never had alcohol, but that's mainly because my role in the group is to make sure we don't do anything dumb. I agree with you on the latter point, since I do like having control over my actions.
I don't mind people drinking and I'll even have a few myself occasionally.
But dunk people irritate me and I have no intention of being like them, largely because it won't end well for anyone if I don't feel in control of my actions.