I didn’t find the French to be any different than Americans.
People in Paris were often rude. That is true of any big city. How is this any different than the rude people in DC or LA or San Francisco? Big city people are stressed out and defensive.
I found French people in rural France to be warm and friendly.
I toured the Normandy beaches for the 60th anniversary of D-Day. We had someone on our tour fall terribly ill. One of our group took them to a house in the rural town of Caen, which was the first town liberated on D-Day, by the Canadians I believe.
They knocked on a door only to ask for a hospital location. The French resident not only told them, he took them to the hospital, waited while the member of our tour received treatment, and then drove them back to our hotel.
FWIW, I found even the French city people were less rude when you made a strong good-faith attempt to speak French, and not be the ugly American acting like the waiters and clerks are your house slaves just because you are throwing US dollars at them.
You want rude? I am 53 years old born and raised in San Francisco. That city is RUDE! Massed immigration and years not teaching children manners results in a city of people that are just rude, opportunistic, selfish, self-centered takers. I lived in San Francisco from 1996 to 2007, and in all that time MAYBE 10 drivers waved to me when I let them in my lane or let someone in a street from a parking lot. Seriously. This used to be standard fare in the 70s. Now they act like they deserve to be let in rather than acknowledging a courteous act.
I think the people of San Francisco are at least as rude as those in Paris. At least.
I was stationed at 6th Army HQ at the Presidio of San Francisco from Oct 1991 to Sept 1963. This was before the hippies, before Harvey Milk, before Nancy Pelosi, and before the invasion of derelicts. SF was a beautiful city with, for the most part, friendly inhabitants. But change does come.