I understand the real world. That does not make it right. We are supposed to be free to associate as we desire. Free to run our own affairs. How is this free? I know, I know, it's not allowed. That does not make it right.
While I agree with you in general, I would not want to be part of a society where I was, say an Asian man, doing good work and enjoying a good career when suddenly a new manager is brought in who hates Asians and abruptly fires me for no other reason than I am Asian.
That society's OK with you?