i work with a couple of pretty country ladies and their vernacular kills me everyday! things like "ain't never gonna work" and "warsh my truck"
Apparently some scientists who study the way peoples of the world speak reckoned we NZ'ers sound most like the Neanderthals would have done. Far from being offended, I think they're spot on. Goodness knows then who spoke like Australians!
But regional dialect and idiomatic expressions are part and parcel of living anywhere in the world, and no matter how hard teachers and tutors might try to promote the correct use of language, there's always going to be regional expressions that do things like use double-negatives.
Some of you will know the wonderfully pointed joke about the graduate from an Alabama University who went off to Princeton Uni to do post-graduate study. He asked a terribly well-dressed young man (you'll have to imagine the accent/dialect):
"Excuse me sir, could you please tell me where the library's at?"
"You ignorant fellow, do you not know that we at Princeton never finish a sentence with a preposition! Now ask me your question properly."
"Oh I do beg your pardon sir, allow me to rephrase my question. Could you please tell me where the library's at .... a***ole!? [oops, will that get blanked out?]