I have found that the best way for me to deal with it is with the truth and no one bugs me after that. I tell them I don't drink anymore, I got into too much trouble drinking and I feel better than ever. Simple truth. Then they continue with their drinking and I drink my non alcoholic beverages and I do the same stuff they do. I talk sober, I play pool sober, whatever it is .. Only difference is I'm capable of driving home safely afterwards and won't deal with a hangover the next day.