Class based discrimination exists along side of racially based discrimination. Often, "white trash" is used as class and racially based slur. Ironically, it is often seen as a moral failure for a white person to be less educated and poor or very poor. I have not seen the same class based discrimination towards racial minorities, as lower to middle income is expected.

While I agree with your closing statement, I've sat in a few courtrooms where it has been very clear that white people with less education, income or job security are treated with a harsher temperament than some others.