Shanghainese, often known as the Shanghai Dialect is the largest single mutually intelligible form of Wu Chinese - the collection of languages spoken in the Jiangsu and Zhejiang areas of eastern China.
To the untrained Western ear the language sounds much like a swarm of live wasps being farted out of a screaming bulldog, which is also what it sounds like to other speakers of Chinese who are not from Shanghai or the surrounding region.
It is true that Chinese persons native to Shanghai look down on other Chinese who can not speak the dialect. However since most Shanghai men wouldn't fare too well in the ring after three rounds against a wet sock, they're not likely to put up much of a protest if you tell them to sod off.
Shanghainese is the language to learn if you are a ranting old lady or a whiney little twat
The language natively spoken in Shanghai, China. Unintelligable from the official language, Mandarin Chinese. The ability to speak Shanghainese with flare makes one a true urbanite in this metropolis. The native Shanghainese generally have a lower opinion of other Chinese those who don't speak the language.
"Ni jian shang hai hua ma?" in Mandarin is "Nong gahng zahng heh wu va?" in Shanghainese.