https://www.reddit.com/r/news/comments/nccpl2
This happens all over as well as when I am with a friend of mine and when we walk by their car women lock their doors.
Over 30 years ago I was sitting in the back seat of a friend's car. We were on a double date, and while sitting at a light, a group of young black people, mostly black men were walking by in the cross walk. The girl up in the front passenger seat reached over and locked her door. The black men saw what she did, and started laughing, smirking, etc. It was really embarrassing.
Then again, about ten years later, I was walking across a cross walk as well when the woman in the passenger seat of their car did the same thing. The ironic thing here is that her reaction was probably justifiable because as soon as she did that, I wanted to run up and jump on the hood of their car and start screaming at them.
I was in a seriously bad mood, and not to be trifled with, but I was on a much more important mission and harassing her just wasn't a priority.
Another time not long after that incident, I was walking on a park path, and as I was getting closer to an elderly woman ahead of me, I noticed that she reached down into her pocket to retrieve her keys which she held in such a way as to use them as a weapon. She held them so that the keys themselves were pointing out in between her fingers. I gave her a wide berth as I passed her just in case she decided to take a swing at me.
So I don't see it as systemic racism as much as systemic fear and paranoia.