Everything in this world is decided by your percentage of marks. One can only get marks from forming relationships with others. The more Blue, the better, while the more Red- then you're like Aaron.
Aaron lives in a society where the people you form your relationships with decide your place in the world. He is a Red, therefore considered a 'bad' person by society. His only goal is to become a Blue, because he believes that's the only way he can be good.