As a wealthy Pashtun, he doesn't want to be seen playing with a low life Hazara, even if it is his life long friend Hassan. This mistreatment and the thought that they are not equals is one of the many things that Amir has done to Hassan. Even though most of it wasn't said, it was still thought by Amir and that's what counts. The thought to prove Baba, the jealousy and social status of Hassan builds up to the most dishonourable mistake that Amir has done all his life.
Throughout Amir's childhood, he had multiple opportunities to show Hassan he was more than a Hazara servant to him. The most important time he could've redeemed himself was in the alleyway when Assef was brutally beating Hassan up and raping him. Amir said it himself"I actually aspired to cowardice, because the alternative, the real reason I was running, was that Assef was right: Nothing was free in this world. Maybe Hassan was the price I had to pay, the lamb I had to slay, to win Baba. (Hosseini, 82)" Instead of saving Hassan and risking his own safety, he ran away and gained Baba's pride. Amir was a coward and this showed how selfish Amir was and how Hassan was of little value to him. The effect of Amir's actions caused their relationship to change forever. Hassan would sleep all day and whenever Baba mentioned his name, Amir would be disgusted. When Baba asked Amir to invite Hassan to the cinema, Amir thought: "Why did Baba have to spoil it like that?" (Hosseini, 86). This shows how much Amir hates it someone mentions Hassan's name. When mentioning his name, Amir gets reminded of the day in the alley. He instantly feels loads of guilt as well as shame for what he did to his best friend. He relates their relationship to the dream Hassan had when they were swimming in the lake: "I thought about Hassan's dream, the one about us swimming in the lake. There is no monster, he'd said, Just water. Except he'd been wrong about that.