local variations in grammar tend to be internally consistent, they're not "bad" they're just different..
I think that the whole accent thing in England is fascinating. I most certainly noticed it, but it was very hard to understand the importance people place on accents there. It's so complex, and there are hundreds of variations and meanings that can be extremely subtle. Not like here, where you hear a Boston accent and think automatically the guy will be rude etc.
In England people are assessing and making judgments constantly based on differences that I couldnt even hear. When I wanted to introduce people that might like each other, like at a kids party or something, I would often have to work hard at forcing people to give each other a chance because they had written each other off at first introduction. This was based
only on accents. There were no educational, financial, or appearance differences that were noticeable. I dont think Americans do that or relate to it, the closest situation might be someone dismissing a person that was using bad grammar with a southern drawl as stupid, or possibly ghetto slang ( yikes, can you say ' ghetto' anymore ? ) I dont even know, I'm not going to call it ' the'hood' but you know what I mean.
I saw some real abuses of power based on the whole accent thing in the UK. In the US you can sound like you grew up with a silver spoon in every orifice, but if want somebody's money for your business, you better be able to throw down some hard core credentials and verifiable facts!