I know from a couple of months in Columbus MS that everyone is polite to everyone, and the two colors are all mixed up and intermingle in the day time.
But after dark you better be on your side of the tracks.
St. Louis same way. You better not get lost or run out of gas.
Where I first lived, the damn grocery store had armed guards.
Saw the same in Dallas.
Detroit was the worst.
I think Nashville is nice if you have the money. Then most places are like that. Seattle can be really nasty too.
Perhaps the dangerous locals are nocturnal. You didn't run into them during daylight because they were sleeping in, resting up for the night.