I work as a cashier in a gas station & get plenty of rude people (esp talking on cellphones) The other night I had a young man 18,19,20ish come to the register who was very indignant. He had held the door open for an older man & the man never said Thank You. The kid said if it had been him who didn't say Thank You, the older man probably would have blasted him for being rude & he's probably right I know the man the kid was talking about. He IS a rude son-of-a-gun. I don't blame the kid for being angry.
I can always tell when the kids who come into the station are in the military. It's always Yes maam, no maam. I don't like being called maam--it makes me feel old (I'm 68) but I appreciate that these kids are so polite.
BTW I mean no disrespect when I call them 'kids'. to me, they're all just babies.