Discrimination comes from separating ourselves from others & thinking that we are superior over them, this illusions of feeling superior is making the man to think others as inferior & instead of accepting them, they begin to discriminate. like Hitler over Jews Christian and straight homophobes towards gays some gay men towards effeminate men. like Britishers over Indians in the past Americans towards American Indians in the past. etc.
As many psychologists believe. It's the 2nd and 3rd step to tyranny.
Discrimination is not a quality found in true superior man or as we call the as wise-men.