Tom be honest talking about 'correct' pronunciation is as erroneous as talking about 'correct' language, and when you say you dislike a certain accent, dialect, or language you are only betraying your roots and values.

In fact drawing a line between accents and dialects is fairly pointless; it sounds how it sounds and if the pother person understands good, and if not one or both parties will have to try something else.

R's between vowels? What about the Bristol 'L?' The very name of the is is in fact Bristow (Bright Harbour), and that's just how they talk in that areal.

I do personally find some accents harder to understand than others, but they are all as completely valid as each-other, and if people put values on them (one way or another) well, that's what happens. (That said, sometimes I catch myself thinking people are putting it on for effect, and have to remind myself that's just how they talk).

If an accent seems ugly to you, remember that the people who talk that way use it to sing their kids to sleep and whisper endearments.

Tom