I would have been put off as well. Thankfully the airlines that I usually travel seem to encourage my getting drunk while sitting up front. In fact, I usually have to cut THEM off from serving me. Unless you're a hostile drunk or at the point of being incoherent, the FA should continue to serve you. If alcohol is such an issue for the airlines, then they shouldn't be serving it in the first place. But it's not. You just happen to come across a bitter purser, who also lacked in customer service skills.