I Think there should be a healthy balance, I mean, you should still focus on your hobby but not let it consume you, doesn't mean go party and get drunk every night, but nothing's wrong with a few beers every now and then and some good grub.
I personally never drink and I never get drunk, not because of bodybuilding, but its just something I never got into, not even in college. But I still go out often, and in college when I was training and was competing I was still hitting the clubs and going out with friends and having a good time, heck I was even eating out regularly during contest prep, even 1 week out I was eating out, you can still eat healthy when you go out! I can honestly say I've never really had any relationships or friendships ruined cause of bodybuilding, my close friends today are the same friends I've had since High School, some even from Middle School, and they all know me really well so even though they may not understand my lifestyle, they know me well by now that they know what to expect and what not to expect from me when I'm around!
I think some people take it too far, just gotta balance it out, you can still make great bodybuilding gains but at the same time have great friends, great relationships, great job, all that, its not one or the other. I believe bodybuilders by nature are very one track minded / obssessive people so if they get into sometihng its all or nothing with them, but that doesn't have to be a case!