I didn't even grow up in the Lower 48 except for a few years in a suburb of DC but I went to college at an elite university in the Northeast. For my money, Southerners were no more racist than Northeast liberals. The big difference was Southerners weren't subtle or politic about their views. Today, I'd say whites are no more racist than blacks; indeed, far less so as a group because whites have had white guilt drummed into them fora few decades now.
Hear anyone called "not white enough" in the last few decades? I didn't think so -- but I HAVE heard someone referred to as "not black enough" in recent years. And for the record, in today's lingo of "enlightened" racism, I'd probably be termed a banana ...

