Very well description about gender.

if Allah created not in differences, such as sandals, a person only wears the right sandal when one is right and the other is left, Likewise, humans as perfect creatures of God only reach perfection when there is a different gender.

Humans are best creation on this earth. You talked about gender descrimination, offcourse in many area its still exist. You are right in Afgganistan girls are not allowed to go school. But in certain areas of villages of Pakistan same situation persist.
Best of luck