Still too broad a brush and can be offensive, but, including with my french friends, I call it the Parisian Attitude. I am sure we all have met people from all over France who do not convey this attitude in any way. Good family friends in Avignon had a young woman of my generation move to Paris for work years ago and we still joke with her, whenever given the opportunity, that she has become a Parisian - most anyone understands the reference. Of course, if you are joking with someone like this and it turns out they are from Paris and you did not know it, you need to do a little quick dissembling.