From my experience they have an extreme superiority complex. At each step they have to remind everyone that its in fact them being the best. Had it happen a few times, lately at Rijksmuseum. Ironically, pointing out that they are a joke makes them shut up very quickly and retreat, as is french tradition.
French claim they have the best construction art? No, Italy exists.
Best museums? Met is better.
Best food? Italian is better.
Best wine? Hell, even hungarian is better.
Best cheese?

American is better.
Nicest cities? Paris is a cesspool, I would rather spend my entire life in Berlin than Paris, and thats saying something.
French are high off their farts their entire lives because they rarely interact with outsiders. The moment they do their worldview falls apart.