Should not a perfect man be called 'good'? Would denying Jesus that title be a way of saying that Jesus was a?

It would be a way of saying that Jesus is a sinner. Thankfully, the Bible never says that anywhere. Some people mistakenly believe that Luke 18:19 indicates that Jesus is saying that He should not be called "good". It does not say that. He asked why a person called Him "good". He was asking the person to examine his own motivations. He was not denying His own perfection.