> I'm in SF, and there are some neighborhoods (Pacific Heights) where your risk of getting the cops called at you is pretty high just by walking around at night if one of the nosy neighbors doesn't recognize you. I assume being black would increase those odds.

If you really want to see blatant racism, sign up for nextdoor.com. My Cupertino neighbors are constantly posting about a "suspicious person", and when you press them as to why the person is suspicious, it always boils down to, "because they're black". Usually they don't outright say it, they just imply it, but sometimes they do say it outright.