How is the relationship otherwise? It would be good to talk with him about this... not in a way that makes him feel he’s being attacked though, in my opinion. If you had a habit you were comfortable with, you likely wouldn’t be receptive if somebody came at you in a negative way about it. I don’t drink either but honestly, it seems like this is your problem and not really his. People will always have differences in their relationships. It’s always going to be something. I would evaluate the whole relationship and the person first... but if you feel that strongly about the alcohol then be honest with yourself and with him because issues tend to get worse over time, not better, unless they are truly resolved.