The older you grow the more of it you’ll see. The one place where a man ought to get a square deal is in a courtroom, be he any color of the rainbow, but people have a way of carrying their resentments right into a jury box. 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."

what's the rhetorical device or fallacy used?

http://www.nizkor.org/features/fallacies/

What do you think?

10 years late i guess.

The passage you provided contains a rhetorical device called "hasty generalization," also known as "overgeneralization" or "biased generalization." This fallacy occurs when a conclusion is drawn based on insufficient evidence or a limited sample size. In this case, the speaker makes a sweeping generalization that all white men cheat black men, which is an unfair and unfounded claim. It is important to note that individuals cannot be judged solely based on their race, and making such broad assumptions is both inaccurate and unjust.