I think that those of us who are white and don't have friends or relations of other skin colors, have no idea what it's really like out there. I will explain with just one story of something that happened to me a few years back.
I was driving through Brattleboro in the evening with a dark-skinned male passenger in my car, when I was stopped by a police officer for a missing tail light.
After thanking the officer for pointing this out to me and promising that I would replace the bulb the very next day, he then asked me where we were going.
I was a bit taken back by this non sequitur. But at the same time, I had become aware of my friend's body language. He sat absolutely still, facing forward. Fear was in the air.