The Gospel tells us that the people took offense at him. I think a couple of things are going on.
The first is simple familiarity. They are saying to themselves: We know this man. We remember him growing up, and he was not special then. We know his parents and family; they are not special. So how could he be special now?
We all have some of that tendency in ourselves. Once we have known someone for a long time, we do not always allow that person to change. They have to remain whatever we once knew them to be.
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