What does Atticus call white men who take advantage of black people? What is Atticus's prediction?

From the text:

"As you grow older, you'll see white men cheat black men every day of your life, but let me tell you something and don't you forget it—whenever a white man does that to a black man, no matter who he is, how rich he is, or how fine a family he comes from, that white man is trash." Atticus was speaking so quietly his last word crashed on our ears. I looked up, and his face was vehement. "There's nothing more sickening to me than a low-grade white man who'll take advantage of a Negro's ignorance. Don't fool yourselves—it's all adding up and one of these days we're going to pay the bill for it. I hope it's not in you children's time."

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