Its really all about what you want from your training. I admit I'm pretty hardcore about diet, because I've always believe diet is the MOST important thing in your training. 2nd being exercise and 3rd being supplementation.
I could easily have 3,4,5 beers on weekends, but I don't do it because its not beneficial to reaching my goal. If you don't have any real goals and just goto the gym to "check out chicks" then drink all the beer you want.
and btw, next time read up before you says alcohol will not destroy your gains. Here's a link that you should read.
http://www.ironmagazine.com/article204.html