Some of them are quite racist, but won't admit. I grew up in a small Southern town, and when I go back to visit my parents and friends, I hear the "N" bomb at least once an hour. I am not exaggerating. I hear it the most from people my age (40ish,) and older. Especially the older people. The older they are, the more racist they are. Incidentally, these are the people who traditionally vote Republican.
Anecdotally, a few years ago (2005,) I worked IT at a small hospital in a Southern town that once trained Army Rangers for DDay, to give you a hint. I made friends with a lady who ran the lab. She was highly intelligent, world traveled via the Peace Corps, and had dry sense of humor, which I like. She was also black. I was ostracized from fellow white coworkers that point on. Not every other white colleague, mind you, but most. I couldn't get the time of day from most of the white women I worked with. I was a "n****r lover." I actually overheard that term.
So, when I hear Joe Scarborough, or some other GOP apologist saying that their party isn't crawling with racists, I know they're fucking liars, or completely out of touch with real (blue collar) America.