I think that's what it all comes down to. Different interpretations make for different lifestyles. While it's true that Batman 89 showed us a Bruce Wayne who doesn't mind the occasional drink and has sex with women, it's also true that TDK showed Bruce throwing that drink over the balcony. Yet Batman Begins also showed Bruce Wayne taking a sip of champagne at his birthday party to pretend he had been drinking and was drunk.
Remember the Dark Knight Returns? At the beginning Gordon and Bruce have a few drinks together, and Gordon reminds Bruce of the time he "used to fake drinking champagne by having it replaced with ginger ale".
So I guess depending on the medium and the author, you get totally different approaches of the character. In my personal opinion, I think the more credible approach is the one where Bruce doesn't drink. A beer once in a blue moon is not gonna kill him of course, but I wouldn't call that "drinking".