French people when someone didn’t say Bonjour back:
I worked in a store and sometimes when people are in a hurry they ask their question without saying bonjour and since I am on automatic mode of “bonjour/je vous en prie/ au revoir/ bonne journée” I just say Bonjour and answer their question and I can see in their eyes that they know they fucked up and are preparing for a petty comment so they just try to say Bonjour super fast like a counter spell.