Even so, I'd still feel bad if I triggered it in any way. Both of my parents are recovering alcoholics (40 years sober) and I rarely drink in front of them, even though they have invited me to do so many times. It just seems rude for some reason.
Not just in this situation. I don't drink, but some people I know do (and some don't seem to know when to cut it off, as they think it is cool to have 5 beers when they go out for dinner. But that is a different story). If you are the kind of person that likes to have two glasses of wine lets say when you go out for dinner, but the group of people you are having dinner with that night don't have drinks or maybe just have one. Common sense usually dictates what the rest of the group is doing. My uncle likes to have a few scotches with dinner, but if he goes out with me for dinner he will have one scotch instead of the 5 he might get if he is with his wife or other people who do drink.