it will not stop progress, as long as you still get proper diet, rest, and push yourself in the weight room. Thats assuming you mean get drunk a 1-2 times a week or have a few beers some nights. If you get hammered every night, yeah it will probably have noticeable effects.
Everything in moderation. If you are cutting for a contest its not a good idea. If your just some guy looking to be big and strong its not the end of the world to drink in moderation.