There is nothing wrong with differences in external appearances, labels and external function. In fact, such differences are necessary and valuable. The problem arises when we falsely identify with our bodies and bodily labels and functions. Being unable to see past labels to the person himself, we end up in a world of barriers and conflicts. If you are wise, you can see the person or atma within the body and relate to the person not to his body. If you are wise you are free of prejudice, racism and sexism.