Blacks are portrayed too saintly

I turned it off after seeing the group of blacks silently but strongly walk through a gauntlet of white bigots shouting racial slurs at them, because the blacks were going to SCHOOL.If that scene was a realistic portrayal of blacks back then, then we should all marvel at how the roles are practically reversed today. Whites walking through a black hood can easily get robbed and killed, and far from being silent, resigned sufferers, people of dignity, today we see so many blacks act like loud, profane disgusting animals, who live up to the worst stereotypes. Is thus what MLK had in mind? Because if we judge blacks by the content of their character, not the color of their skin, then it's safe to now say many wear their character on their sleeve, but if we judge this, we are racists, as if black skin, not bad behavior, is what we're judging. Movie seemed like liberal propaganda!