Drinking won't really mess it up directly. Kinda like gettin it on all night won't either. However, if you are too tired or distracted to workout then next day then its bad.
As for side effects or more like interaction of AAS and drinking:
It seemed that different AAS interacted differently. For instance, primobolan led to more agression while just cyp did not. Don't know why.
I got a rush of some sort with the first few drinks (kinda like a pump of sorts)and would drink more than normal.
If I saw someone being rude to a girl, picking on someone, or disrespecting a property of the party host, I would confront them even though it was me vs more of them.
Anyway... in moderation there is not really a problem.