Dialect, vernacular, patois?
The other I found quite an interesting article about Shanghainese which suggest that’s it has become a bit more popular recently, and is being used for some announcements in public transport and on planes, and that children are allowed to speak it at one school, at least during breaks.
The article says that about 10 million people in Shanghai speak Shanghainese, and then another 10 million don’t. Some of the non-Shanghainese speakers “consider the vernacular pride movement either unnecessary or unwelcome.”, and one woman who has spent most of her life in Shanghai seems to proud that she doesn’t speak Shanghainese.
Shanghainese is variously referred to as a lingua, a dialect, a vernacular and a patois at different points in the article, though not a language.
Though there are slight plenty of Shanghainese speakers, there are apparently relatively few young speakers, which is not a good sign for its future.