If you’ve ever sat down at a bar and felt like the person behind the counter serving you drinks was acting like they were superior to you or carried an over-inflated sense of self-worth, it might be because they’ve noticed that it helps to get them better tips.
Maybe you felt like they were turning their nose up at you, or perhaps you felt like they were slightly criticizing your beverage of choice, and that very well could be by design.
Source: https://www.distractify.com/p/bartender-act-richer-than-clietele