My excuse, when I decide I need one is "I'm just not feeling like I want to drink today." If anyone tries to put the thumb screws on me (which only occasionally

My excuse, when I decide I need one is "I'm just not feeling like I want to drink today." If anyone tries to put the thumb screws on me (which only occasionally happens), I say "I've never folded in front of peer pressure before, it's unlikely I'm going to fold today. I don't feel like drinking today." Usually that's enough to get people to drop the subject. If they still continue to the point that I've had enough, I leave. If my friends can't respect my decisions without fighting me on it, I don't want to be around them. They'll have way more fun getting drunk without me anyway, so I'll leave them to it and see them another day when either I do feel like a drink or they don't feel the need to coerce me into drinking against my will.