I can't think of any accents I dislike either. Don't dislike a Boston accent, but it does make me laugh sometimes.

I love a soft Southern drawl, but the heavy backwoods, hillbilly thing that some Southerners have has got to go! I myself am guilty of saying "y'all", and my relatives in Alaska and Ohio never stop teasing me about it.
And I love a Jamaican accent...I have a couple friends from Jamaica, though you can't tell they are from the islands until they get mad...it's pretty funny actually.
And as far as you Brits...I don't descriminate...you're all invited to my house to sit and talk to me.