I agree with Steve. Language is fascinating in all its diversity.It gives a clue about the speaker's origin, experiences and educational progress. I adore accents, and have quite a bit of talent for learning foreign languages. I can imitate many accents, and have done so since I was about two years old. I also accept that all languages evolve over time. We no longer speak as if we were Tudors!
However, having been a teacher for all my working life, I find myself bristling at poor grammar, cringing at 'dropped aitches' (or 'haitches', which seems to be the new pronunciation!) and stopping myself firmly for having the cheek to correct someone's speech (particularly here in Norfolk, the dialect of which I adore)
As I've said on here before, my favourite 'new' word is innit. Innit eh?