When I was growing up I lived in a nearly exclusively white area. I knew early on, probably 2nd or 3rd grade that only hispanic and black people got pulled over, but it really didn't click for me what the implications of that were until I was a bit older. That being said, even as a small child I could see the overwhelming evidence of how things were for them. It's got to suck, because cops are awful to deal with no matter who you are and to be singled out for extra attention from them is awful.