Yeah but that's obvious bull$hit! It's just a product of their "culture" and Amir thinking Hassan isn't supposed to be his friend. They are obviously friends, very close friends, in fact Hassan is Amir's closest and arguably at this point ONLY friend and while he may not admit that or possibly even recognize that himself it's abundantly clear. Two kids can't possibly be fed by the same wet nurse, raised together, play together everyday, get along well, and not be friends. That's absurd. In chapter Two when the one soldier hassles Hassan, Amir is clearly worried and concerned for his friend. Amir says, "I reached across my seat, slung my arm around him, pulled him close. He rested his head on my shoulder." Then Amir tells him, "He took you for someone else."

Clearly Amir is Hassan's friend. There is love there. They're like family.

Amir's refusal to acknowledge their friendship is bull$hit. It's like a guy saying movies don't make him cry and then wiping away his own tears when noone is looking.