Who told you these things? Obviously, that's where the problem starts, and though I've never experienced that (nor has anyone I know), I can't deny that it exists.
Older members of my family. They simply related to me their experiences living in the United States. Unfortunately the Civil Rights Act of 1964 was not that long ago and the world didn't change overnight with its passage. And they received similar teachings from their parents who dealt with even greater injustices before that.