This is just cultural norms at work. I guess you can see this as "alcoholics normalizing their behavior" if you think everyone who drinks is an alcoholic. I get similar comments when I say I don't like chocolate. My son gets flak (including from me!) because he doesn't eat pizza.

If you lived in a teetotaler culture, you would experience exactly the opposite (strange looks/comments for drinking a beer), or possibly worse (since many teetotaler cultures see drinking as a punishable offense).