A man had a misunderstanding with his neighbor, and one of them gives the salam while the other does not return it. Do all of them sin?

Question:
He says: Honorable Shaykh, may Allah grant you success. If there is a misunderstanding between a man and his neighbor, and they become angry and upset, the problem is that one of them gives the salam and the other does not return it to him. Do all of them sin because of this?

Answer:
The one who gives the salam has absolved himself of blame, and the one who does not return the salam sins. It is obligatory for him, and he has left an obligation. He has also left reconciliation, so the sin is upon him. As for the one who gives the salam, he has fulfilled what is required of him. Yes.