When you drink alcohol, it becomes your body's primary source of fuel - not because it's good for you, but because your body immediately goes to work, clearing it from your body. Therefore, your body won't be trying to rebuild muscle after your workout.
Don't get me wrong, I LOVE booze - all forms! I drink quite regularly and quite large quantities. However, you AT LEAST want to give your body an hour or two to full digest and assimilate you post-workout meal. So if you're in a hurry go start boozin', it's best to have a post-workout shake that will get digested faster.