When I were a lad, I worked in a coffee shop, and for a while had to wear a name badge. Some customers tried to pull the old familiar "PDX, my friend" truck with me. In the service industry, I was used to people calling me by my first name, but the faux familiarity was almost as bad as people dropping bible verses in the tip jar (which, by the way, don't put food on the table).

Eventually I dealt with the problem by, withy boss's permission, changing my name badge to Elliott (not my real name, given or surname).