Because of the men in charge of this system, they've created this caste system for women that gives some of the women in higher places a false sense of authority. You have women who are able to just look at other women and from the color of the clothes they are wearing and they can know how they're supposed to interact with each other. It's a really horrible thing but genius in a way to pit them against each other because once you are, there is no community anymore. There is just people trying to keep each other down.