Skin color, race, language, orientation and a tons of other things here.
We can never get rid of it. Why is that? When will we realize that we are just digging our own graves with it?
And another thing is... positive discrimination.
Is it better? I don`t think so. But how about you? Do you think it is different than its negative "blood relative"?
Did you had any experience in any way with discrimination? It does not matter if it was positive or negative. Share it with us so we just might find out something about those reasons.