I personally find it amusing that some Brits, and understandable so, when hearing Americanism twinges the ear. .
Really? I think put-on regionalisms are horrid to listen to. New Hampshire hosted the NASCAR race over the weekend, and someone on a local radio station was doing their drops from the race in a fake southern accent It sounded awful. It wasn't intended to be satire, either.
It would be fine if the person was from the south and never lost the accent, but a North Country voice trying to do a southern drawl? That's all kinds of wrong.