Years ago (pipes up the garrulous old lady) voices on the BBC (radio and later the TV) were always speaking in Received Pronunciation, known as RP. Lately, regional accents and personal 'mispronunciations' are permitted. Now, after studying Phonetics and Linguistics as part of my Master of Arts degree, I've grown to love quirky speech, accents, idioms, even mispronunciations etc. If everyone spoke like the RP Robot, it would be rather boring.
And language has always 'evolved' over the centuries. We don't speak as Shakespeare might have done.
Living in Norfolk, I'm fascinated by the locals' funny speech. As I was in Glasgow when I lived there.
I'm trying nowadays to be less snobbish, and to stop feeling 'superior' merely because oi talk proper!!