I live just by the French border in Belgium (the dutch speaking part), I've been together with a girl from Paris for a couple of years and in a past life I was a waterski instructor for club med. So I've met my fair share of French people and I can tell you this is definitely a thing. Parisians even had this reputation amongst other French people. But I feel it's becoming a thing of the past as well. The younger generation seems less chauvinistic and more friendly in this regard.

I remember talking to a friend in Paris. I was talking in English about a trip to Disneyland I had planned. And this older man who was just passing by came to give me a rant in French of how an American theme park in Paris is just a disgrace and should be forbidden from ruining the superior French culture. Of course, this is just one anecdote, but I've got quite a few of those.