I wished Baba would stop calling him that. How often did he call me “Amir jan”? “Thanks,” I said. Assef’s mother looked at me like she wanted to say something, but she didn’t, and I realized that neither of Assef’s parents had said a word. Before I could embarrass myself and Baba anymore --but mostly to get away from Assef and his grin -- I stepped away. “Thanks for coming,” I said.
What inference can reasonably be drawn from this passage, which takes place at Amir’s birthday party in chapter 8?