I'm gonna challenge you a little on this - tell me why
I understand that you didn't feel as if this fellow was disdainful or jerky to you.
Let me put it like this: My father came from modest means. He was American born but was also second generation Albanian.
My father's family moved to Grosse Pointe, Michigan. Which, even in the 70s while I was growing up, and certainly when my dad was in high school, was lily white, affluent, and shall we say, "exclusive." He didn't fit in to that category and they let him know it.
He put himself through law school repossessing cars in the dark of night. He became a very successful attorney and a self-made man. So much so that he was qualified to argue before the U.S. Supreme Court, which in fact he did.
As he became a success, the same country clubs and other playgrounds of the rich that rejected his applications for membership in the past came calling. I think you can guess what he told them.
My point: Both my father and my mother (who grew up on a farm) made it explicitly clear to their eight children that
everyone -- including a trash collector, a waitress, or a cashier -- deserves respect. And should be treated accordingly.
Often, those who come from privilege, as I did, are completely oblivious to the hard work and hardships experienced by those they consider their social inferiors. Many are born on third base and think they've hit a home run.
I've worked plenty of retail jobs, and I know what it's like to be treated poorly by self-absorbed jerks, demanding Karen's, and clueless dopes.
If you have any compassion or thoughtfulness at all, live the Golden Rule.
Treat others as you wish to be treated yourself.
End rant.