I remember as a kid I locked the door to the car whenever someone would walk by. Most people don't really notice or care but once a black guy walked by and I didn't know about the racist connotation, so I just did what I always did and was devastated when I could see that I really hurt the guy's feelings. I stopped doing it after that, now I just give a little friendly wave or smile. I'm still as overly cautious, but I'd rather get stabbed to death than make someone feel like that ever again.

If I see someone in a black hoodie I'm crossing the street

More recently, I'm immediately suspicious of someone who is very obviously not immunocompromised; wearing a Covid mask with the hoodie up. Especially if they have sunglasses on. That person is either bipping cars or about to steal something. Best to just steer clear. I only ever really encounter these types in SF. They aren't worried about Covid, they just don't want their face to be seen.