There are Americans who rhyme "heart" (ar sound) with "court" (or sound)? I actually didn't know that! But yes, a Southern accent is sometimes considered uneducated - rather like the Northern accent in England, I think, or maybe the Bayrisch Aussprache in Germany? It depends on how heavy the accent is, really.
I don't know what it would mean that you got New York! I tend to think of New York city accents as (1) nasal (2) full of diphthongs (3) droppping the 'r's on the ends of some words, and then adding them in on others where they don't belong. I have an Aunt who speaks rather this way - a true Bronx accent. It's actually interesting that, even in America, where there is so much influence from TV and other mass media, and people travel so much, there are still identifiable regional accents.
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I don't know what it would mean that you got New York! I tend to think of New York city accents as (1) nasal (2) full of diphthongs (3) droppping the 'r's on the ends of some words, and then adding them in on others where they don't belong. I have an Aunt who speaks rather this way - a true Bronx accent. It's actually interesting that, even in America, where there is so much influence from TV and other mass media, and people travel so much, there are still identifiable regional accents.