There are people alive today who survived a white-against-black race riot that killed hundreds in Tulsa. There are people alive today who were imprisoned and threatened with sterilization for being gay. There are followers of Islam alive today who needed police protection after the 1995 bombing of the Oklahoma City federal building instantly became an anti-muslim witch hunt. Oklahoma is objectively one of the most backwards places in America. It might be better than it was, due largely to federal preemption of their theocratic laws, but it's still incrediby intolerant.
The thing about small towns is the people are generally really nice to you, but not so much when referring to a group that includes you. One data point: a man who loved talking to people regardless of color or persuasion. But, he'd talk about a group of them with much negativity. Blame it all on FOX News?
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"prevalent"? Like how? I think you are making up. Still exist? Definitely yes. Prevalent? No way. Unless you have a very different kind sense of "prevalent".
Actually people in small towns in general are much nicer than big cities and usually they don't care about your skin color or whatever. And they in general appreciate "a slight countercultural bent", unless you have a different sense of "slight".