This is what I understand from this video of Brother Eli:
In Mark 6:3 Jesus was described as a carpenter by the Jews who judged him based on his family background. They saw him as an ordinary person whose brothers and sisters they knew.
Joseph, his foster father was a carpenter. But at the time of his preaching, Joseph was already dead. This was why the profession of a carpenter was passed to him.
A carpenter was a lowly profession so, Jesus lived a normal life like ordinary people. But when he started his teaching, and performing miracles, people realized he was not just an ordinary person.