A few drinks is fine. Can make things a lot more fun even. But people getting drunk while gaming...big no no. Even with pc/console gaming. Your focus and reaction is just gone, and it isn't fun for the others. That being said, D&D is about having fun. You shouldn't take games like that too seriously. I'm a huge fan of tabletop games, but taking it too seriously will end badly with or without drinking, imo.