How much damage does alcohol do post workout?

24/f, 4'10" 93 lbs. I lift 4 days a week with 15 mins. cardio warm-up and one day of strictly cardio, which has been my routine for the last 1.5 years. My MFP goal to maintain is 1400 cals. I want to lose that last bit of stubborn lower belly fat and keep gaining muscle. Today was my favorite day - back day. However, all week, I've been jonesing for a beer. I have one Deschutes Black Butte porter in my fridge and a bottle of Malbec. I've heard alcohol lowers testosterone and affects your gains. However, according to MFP I'm at 1073 calories today after all meals and my post workout shake, with 99g protein and 105g carbs. How detrimental would a single beer or glass of wine be after a lifting session? Does alcohol really affect your gains? Does anyone else drink and still see good results?