Not innapropriate at all. Not many carbs as most of the sugars are turned into alohol. The stronger the wine, the less carbs. Most normal wines are only about 2 to 3 grams carbs per glass, according to who you read. Even then, the alcohol prevents the liver from processing carbs into blood glucose very efficiently, so you'll get lower BGs after a meal WITH wine than without. Just make sure, as others have said, that there's no other medical reason why you shouldn't drink. And Metformin ISN'T a reason unless you're an alcoholic or have existing liver disease.
Enjoy! (in moderation of COURSE)