I’m not an expert on Paris by any means but when I finally did go there in 2015, I never got the sense that Parisians were any (or less) rude or obnoxious than people in any big city I’ve ever been to in the world.
The other part of it is, they live there. NO is their home. It’s not ‘special’ to them in the way that it is to a traveler who goes there without any knowledge of the city or its people, only expectations of what he or she will experience.
Another thing is that not everyone who lives in NO is from there. Because tourism, professional dining, and hospitality are big businesses there, it’s one of those cities that brings in outsiders who will stay for a few years before moving on to somewhere else. So it’s possible that not everyone a visitor speaks to is from NO. They might be just there doing their jobs or just getting off work and trying to forget their jobs.
Beyond that, NO is also a city with problems and simmering tensions. It’s a city with violent crime and tourists sometimes get caught up in it, just like people who live there. It’s understandable that people in NO keep their distance and want their space, especially if someone with a midlife crisis is living it up by being a drunken ass. The locals have seen how it plays out and it can get ugly.
I’ve spent a lot of time in Paris, making repeated trips for both business and vacation. I have never been treated poorly by the people there. It’s a very tired meme that continues to be perpetuated by people who wouldn’t know a Frenchman if one fell on them. Most unpleasant encounters are likely due to Americans acting like arrogant Americans.
I found Boston to be fairly intolerant of outsiders when I lived there. They particularly didn’t like people from the military base I was on, although they sure liked the dollars we brought in.
At first blush, it seemed to me that the Portuguese were very cold to outsiders, but this is because for many decades it was a very closed society and the people tended to be clannish and dour. When you get to know them, they are funny and generous, particularly younger generations.