Sometimes you just have to close your eyes, count to ten, take a deep breath, remind yourself that you wouldn't look good in prison stripes and just smile at that dumbass and walk away. Well, not just sometimes.
Applies mainly to South Africans - and it's so, so true! I had so many "tannies / aunties" and "ooms / uncles" growing up . A form of politeness for adults that the rest of the world has pretty much lost / left behind.