People discriminate for all kinds of reasons. I know men that will only date attractive women. I know one major league businessman who only hires ugly women on the theory that they will stay more loyal and have fewer outside opportunities to leave.
So what?
I know people that are prejudice against blacks, other that hate Czechs, yes Czechs!, and some that hate Jews. Again, so what? If someone spends most of their living breathing hours hating, blacks, Czechs or Jews, I am not going to spend much time with them, if any, because I would be bored to death, but why should I care about their views?
Because of some service or product they provide, I may interact with them, but I really don’t care what their views are on other subjects, as long as they are not advocating some kind of coercion against others, that is, advocating a violation of the non-aggression principle.
The world is about exchange, with a very few people I will have interaction on many levels. With many others, I will only have limited interaction. With most people on the planet, I will have no interaction. If these people are not violating the non-aggression principle, why should I have any obligation to change their views on anything?
Further, I seriously doubt that there are many Americans that are advocating the return of blacks to slavery (an advocacy that alone, without actual coercion, is not a violation of NAP) and I am not aware of any groups actually putting blacks, or any other group, into slave camps. It is a bogus issue.
The one group that I am aware of that does regularly violate the non-aggression principle is the government. There are compulsory school attendance laws, there are minimum wage laws, tax laws and there are anti-drug laws, to name a few. This is a serious problem. Further, the U.S. government is involved with empire building and wars around the planet. This is coercion on steroids, it is a real problem.
