Cultural cues, I guess. When you grow up in a place that is snow white, and lots of the white people are racist, and most of the exposure you have to black people is from music, movies, and TV, you tend to have a distorted view of black people. It's an almost certain outcome. Especially when the closest city to you is Detroit, which is an economically depressed place with endemic crime, and most of the adults you know wouldn't go within the city limits without a really good reason, you will almost certainly be intuitively afraid of geographic locations that are predominantly black. That's shitty but true.