[spacebacon]

Pre primed anger is an opportunity to make someone’s day.

Meet rude introductions with polite responses. If that fails meet rude mid game with a compliment. If that fails meet rude end game with thank you for your hard work. If that fails close with a generous tip.

You are much better off emotionally than they are at this point and may be the one that solves the problem for others they serve for the rest of the day.