This happened to my husband and I while on our honeymoon. We had both been sober about two years, and we went on a day tour. At the end of the day, the whole group sat down for tequila shots. We thanked them for the offer and started to leave (it was late anyway, we weren't leaving just because they were drinking). Then one of the guys asked us very loudly why we didn't want any, because hey, it's Mexico and we're on vacation, right? We just said we don't drink. He asked us why not. Then his wife hit him! It was pretty funny. I'm always surprised when people ask why. It seems like such a personal question, and one that I never would have asked, even before I started drinking. But I usually just blow it off. "I don't enjoy it" seems to be an honest enough answer for me, since my drinking was more like abuse than enjoyment.