Hassan being a Hazaras played a significant role in the book. Because he was a different ethnicity than the others and he was one that was looked down on, this made Amir embarrassed to be his friend sometimes, this made Hassan almost like a toy just there for Amir to play with when he had no other friends around because when they would go out, the others would tease Hassan and call him names, "they called him "flat nose" because of Ali and Hassan's characteristic Hazara Mongoloid features". this shows even Amir's inner monologue had these thoughts toward Hassan but that wasn't necessarily all Amirs fault for thinking that way, that was what he grew up knowing "For years, that was all I knew about the Hazaras, that they were Mogul descendants...School text books barely mentioned them and referred to their ancestry only in passing." This made their friendship almost one sided, Amir cared for Hassan but he would never love Hassan the same way Hassan loved him.