I don't know of anyone actually ON the Gulf coast who talks like that, just in that thick area somewhat north of it - maybe I'm thinking of the Bible Belt, but I haven't bothered to look it up. In another example, I haven't bothered to distinguish between the accents of Sargon of Akkad and Tommy Robinson, but apparently the difference was worth several hundred thousand pound a couple generations ago. According to some reports I've seen (including from the man himself), Tommy Robinson's accent is distinctly "working class". I don't know how I'm supposed to tell, lol!