But will roll out the red carpet (if they had one) when they visit just like anyone else. There was a black kid that moved to our school when I was in HS, my brother befriended him and my mother invited him over for lasagna (her best dish by far). I can only speak for us deplorables in Iowa, but there were very few if any racists in my hometown and I knew almost everyone.
What rural Iowa people won't tolerate is laziness, theft and cornhusker fans.
But I get your point, and in my experience you are exactly right. The people who are most vocal about "social justice" are also the people who are the most "socially insulated". It's because they grew up sheltered and after suffering through Chris' Social Justice 101 class are now are starting to feel guilty about it. Not guilty enough to actually do anything, but enough to affect their dialog on message boards and at cocktail parties.