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It's not a joke. It makes sense.
Wukong listened to Bajie's nagging. He called Monkey Brother Kong all day long. He changed his way of addressing him as Senior Brother. Wukong stomped his feet and was so angry that he gritted his teeth and croaked. As for the beautiful Jadeskin, she was so sweet that she even laughed along with Bajie in a spoiled manner.
Master didn't care about this matter