T.,
I don't think a drink after work/with dinner is inappropriate. That said, maybe it's something to discuss if it's a scotch on the rocks, not a glass of wine (at least wine is a drink normally served with dinner, not to mention some health benefits).
We probably have a drink 2-3 times a week? Usually it's wine with dinner. The kids "pretend" they are having wine too sometimes - grape juice in the same kind of glass. My husband is Italian, so a glass or two of wine is no big deal with dinner. Sometimes on the weekend he'll make me a cosmo or margarita after the kids go down.
I agree that "the talk" has to happen with a spouse if the drinking either seems excessive, affects his mood or health. I will say that I did talk with my husband about his drinking ONLY when we go out with friends, i.e. parties, New Year's Eve, or a "Boys Night Out". I got tired of the next day hangover and having to take care of the kids all night, and they all the next day without help from him. It didn't happen ofter. However it was often on holidays or weekends. So I had the kids all week and then couldn't count on him for any help another day of the weekend. UGGH! My husband agreed this wasn't fair to me or the kids. He still goes out with his friends, but will now be more responsible - eat dinner, drink less and overall be fine the next day...I do send the kids in to get him by 9am - haha.
So overall, I don't think 1 drink a night is a big deal. It's an adult beverage. If it's causing problems in the marriage/family, then it's an issue.