_Mark 6:1-5)Jesus left there and went to his hometown, accompanied by his disciples. 2 When the Sabbath came, he began to teach in the synagogue, and many who heard him were amazed.
“Where did this man get these things?” they asked. “What’s this wisdom that has been given him? What are these remarkable miracles he is performing? 3 Isn’t this the carpenter? Isn’t this Mary’s son and the brother of James, Joseph,[a] Judas and Simon? Aren’t his sisters here with us?” And they took offense at him.
4 Jesus said to them, “A prophet is not without honor except in his own town, among his relatives and in his own home.” 5 He could not do any miracles there, except lay his hands on a few sick people and heal them. 6 He was amazed at their lack of faith
The entire sense is anti-gnostic: Jesus is really the Jewish Messiah and he is hated just because he is the son of the creator (carpenter).
So this episode in Mark is the Jewish-Christian answer against who preached a different Jesus Son of an unknown and alien Father, one who was hated by the Jews just in virtue of the his being an alien being.
So Bultmann was right, afterall: the tradition behind the fourth gospel is more old than the Synoptic tradition.