I tell people to do what they want if they're not hurting anyone.
That said, it is important to remember alcohol in no way promotes performance. In many ways, alcohol is the opposite in every way of anabolic steroids. What anabolic steroids do, alcohol does the opposite.
Here's a little stat you might find interesting:
4oz of alcohol, it doesn't matter the source, but this is enough to slow your metabolism down for 72hrs, and that's assuming no more alcohol is consumed. In short, it will take 72hrs for your metabolism to be where it was before those 4oz were consumed.
Lastly, is it going to be the end of the world if you drink every now and then? No, but it doesn't promote anything and does set you back a little.