Of course it is, are you serious phate?
Its not going to seriously affect his goals...
Have a good time, after all thats what life is about!
I go to the gym hammered. I feel jacked in the mirror because I'm wasted. I have sexual intercourse with some broads and get my cardio, and I get into fights and get my MMA training in, then I sprint home quickly with two 30-racks of Keystone to avoid any legal problems, my HIIT. I go home, pound a protein shake, flex in the mirror, puke all over myself, and pass out in the tub with my flack jacket on.
Have fun!
One or two every now and then is fine. But you make a habit of getting drunk 2-3 night a week it can be seriously detrimental to your goals.