what was the most sickening thing to atticus?

Atticus says that:

"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." 23

I think Atticus just might be foreshadowing the Civil Rights movement.