A glass of wine has a pretty low calorie count compared to other alcoholic beverages, so it is definitely a good choice of drink to go with meals or to order on a night out — as long as it doesn't turn into more than a few glasses.
While it is true that caloriecounting is pretty much superfluous when you eat a high fat, moderate protein and very low carb diet, there is an undeniable correlation between calories and weight loss or storage.