In my experience, the people whom I know drink too much have fallen into two stark camps: those who express respect for my giving up and sticking to it, and those who insist I should drink. I'm quite an easy-going person socially so I just tell the latter type "no" and then let them carry on.
I'm also single. I've been told by a "well-meaning" friend (after a dinner where he'd drunk lots of wine and was onto a Rusty Nail) that I would never find a guy who would appreciate a girl who was stone cold sober. Aussie blokes apparently can't deal with a sheila who doesn't drink.
Well, firstly, that's just rubbish. And secondly, if it does turn out more difficult to get into a relationship if I don't drink, that's just going to have to be the case. I'm not compromising my sobriety for anyone.