There are plenty of bars where, if that's how drunk people act, and the bar staff has any sense, then the drunk people get kicked out. The drunk people get kicked out because it's bad for business, i.e. if people are made to feel unsafe (and I think that's a far better term to use than "are offended") and their only option is to leave, the bar loses the business of many people opting out in favor of one or more drunk assholes. There are some obvious parallels here that, IMHO, only help the argument that bad behavior should be called out and corrected, not seen as a fact of life.