What does General Taheri worry about when he comes to visit? What is Amir's reaction to this?

One day, General Taheri said, "People will ask. They will want to know why there is a Hazara boy living with our daughter. What do I tell them?" Amir, angered, told the general that Sohrab was the son of his illegitimate half-brother and told him never to call him a "Hazara boy" in front of him again.