I mean nationalist or cultural chauvanism. Again, I am genetically 50% French, so don't think I am not invested in this personally, but I have sometimes found a sort of aspersion cast on you if you don't adhere to certain cultural norms, and then there's the language politics issue too. If you don't speak English in London or Birmingham, it's mostly fine. If you speak another language in France, it can sometimes be treated with arrogant condescension, or worse. I don't want to make a big deal out of it, but I do think the French are well known for their cultural and linguistic chauvanism, and I've experienced it, even from Frenchies in London.
Bear in mind, I hate this from anybody, Brits included.