I'm a linguist and I grew up in Maryland and wouldn't call it crappy. Slightly over the top and perhaps once in awhile going a little too far to the almost Canadian sounding Irish/British influence, but instantly recognizable to me as Baltimore. I actually wonder if she isn't maybe trying to do a "period" Baltimore…

"A people expressing their misery with their cocks."

Kathy Bates also said on Twitter that she's doing a Baltimore accent. There's no mystery here as to what accent she's attempting.