I'm sorry, but did you just dismiss discrimination against racial minorities... Because they are minorities?

No, I just pointed out that it's easy to guess someone isn't a minority because minorities aren't common by definition.

It's also easy to guess someone isn't a black person because black people would be aware of the litany of human rights abuses that were common and systemically applied in the US prior to the 1960s (and some still today).

Do you think people who are not black are unaware of the history of black people in America?

Not all of them, but your comment showed a startling lack of awareness of us history.