Pride and social class often go hand in hand not only in novel but also in life. Amir is from a higher social class than his best friend, Hassan. According to the book, Hassan is from a lower social order. He is an Hazaras. And this point defines him. Here is quote:

That Hassan would grow up illiterate like Ali and most Hazaras had been decided the minute he had been born, perhaps even the moment he had been conceived in Sanaubar's unwelcoming womb – after all, what use did a servant have for the written word?

Amir, on the other hand, was educated and his father was a respected member of the community. This point set him apart and above. Unfortunately, this privilege also led to pride. Amir thought he was better, not on account of character or merit, but because he was born in a higher social class. So, he thought he could treat Hassan with contempt. So, when Hassan was beaten and raped, Amir did nothing. Part of it was out of fear, but social relationships also played a role. Likewise, when he framed Hassan, social issues also played a role. We can say that Amir was preoccupied with himself, which is rooted in his pride and privilege.

Only as an adult did Amir change his ways.

Amir's pride affects his decision to intervene when Hassan is being raped by Assef. His choice to accept the blue kite, without informing his father of the terrible events that took place after the tournament, is further evidence of this. Amir demonstrates his selfish, prideful nature by dismissing Hassan's horrific ordeal in order to earn Baba's respect and affection. Amir wants to feel proud of his accomplishment, which is why he accepts the blue kite without acknowledging Hassan's traumatic experience. Amir is also aware of his privilege and is not worried about Hassan telling Baba about everything that took place after the tournament. Amir then uses his privilege to avoid Hassan and even sets him up in hopes of getting him removed from Baba's home. Amir places his birthday gifts in Hassan's shack and tells Baba that Hassan stole them. Amir's selfish, callous actions reveal how pride motivates him to dismiss Hassan's traumatic assault and how he uses his privilege to accuse Hassan of stealing his gifts.

Amir is guilt-ridden over these matters even as a young boy. Although he enjoys the company of his playmate, Hassan, Amir cannot bring himself to call Hassan his "friend." He has grown up with the boy in Baba's household, but Amir cannot get past the fact that Hassan and Ali are Hazaras--the lowest ethnic class in Afghanistan. He does not consider either of them as his equal, and he is ashamed of their physical deformities. Amir rarely visits Hassan in the little house on Baba's property because he feels it is beneath him. Amir is also jealous of the attentions that Baba shows toward Hassan, and he is ashamed that he is too cowardly to stand up to Assef when he is threatened in the streets. Baba also sees how Hassan stands up for Amir, and he considers it just one of his son's many weaknesses. Instead of accepting the lowly Hassan, Amir's pride and jealousy instead forces him to concoct a plot to disgrace him. Amir is happy when Hassan and Ali leave, but the guilt that begins to consume him will last for most of his life.