Remember that dinner over which RB's mom got very upset about him considering having her immigrate to Canada? Well, the 80+ yr old friend who happened to be there, felt obligated to help mediate the situation.
RB is meeting her for dim sum, while his mom is hiding out in Hong Kong. She honestly told him that she understands where RB is coming from and should live his life how he sees fit. However, she was unable to say this truth to his mother.
RB realized, or rather confirmed his suspicion, that his mother hears only people agreeing with her. No one has dared to be impolite or mean to say otherwise. He must do the difficult task of confronting her.