Maybe it's only English speakers who get smug about language

Oh, no. A Cantonese-speaking friend of mine rolls her eyes at a mutual Mandarin-speaking friend who sneers at her language as being 'not really Chinese' - she tells me this is prevalent among Mandarin speakers. I'm given to understand as well that there are parts of Belgium where people are snooty about speaking French to the point of pretending not to speak Flams. And apparently migrant workers in California who speak minority (in their native country) languages like Mixtec are looked down upon by Spanish-speaking workers.