It doesn't say anything specific about education, but of the 6 profiled in the piece most lack college education and those that attended college talk about no feeling the fitted in either due to coming from a rural area or because of their right wing views. At least 2 said it was at college that they really became radicalised and see themselves as being in opposition to what they saw as a dominant liberal discourse.
I think, like Brexit, education is a factor. If nothing else education leaves you more able to sift out fake news and alternative history. I seem to remember seeing something that said on the whole people who were exposed to a wide range of cultures were less likely to be racist, which could also explain to some degree why people in cities are generally more open.
This article by Laurie Penny is from February, but I found it very interesting in seeing some of the guys drawn to the "alt-right" brand of white supremacists. After Charlottesville she wrote another article in which she said she now felt she had been too sympathetic in the article, but I still think it is a good read personally.
ON THE MILO BUS WITH THE LOST BOYS OF AMERICA’S NEW RIGHT
psmag.com/news/on-the-milo-bus-with-the-lost-boys-of-americas-new-right