Why do you call me Good?

When Bible says Lord Jesus Christ is Good, we must understand that he alone is Good - Good and upright is the Lord; therefore he instructs sinners in the way - Psalm 25:8 & Praise the Lord, for the Lord is good; sing to his name, for it is pleasant! - Psalm 135:3

For example, A college can have only one principal, and A country can have only one President, like that only one can be Good that is God Jesus Christ alone, so, Good is the Title belongs to Jesus Christ, and we should not use it for worldly people.

Once a rich young man called Jesus Christ with the Title of Good - 17.As Jesus started on his way, a man ran up to him and fell on his knees before him. Good Teacher, he asked, what must I do to inherit eternal life? 18.“Why do you call me good?” Jesus answered. “No one is good - except God alone”. 19.You know the commandments: You shall not murder, you shall not commit adultery, you shall not steal, you shall not give false testimony, you shall not defraud, honor your father and mother - Mark 10:17-19

But later, he intentionally removed the Title "Good" while calling Jesus Christ - And he said to him, Teacher, all these I have kept from my youth - Mark 10:20

The very moment, he confessed that Jesus Christ is not God by removing the title "Good", He lost the kingdom of God and went sorrowfully - 21.And Jesus, looking at him, loved him, and said to him, “You lack one thing: go, sell all that you have and give to the poor, and you will have treasure in heaven; and come, follow me.” 22.Disheartened by the saying, he went away sorrowful, for he had great possessions, 23.And Jesus looked around and said to his disciples, “How difficult it will be for those who have wealth to enter the kingdom of God!” 24.And the disciples were amazed at his words. But Jesus said to them again, “Children, how difficult it is to enter the kingdom of God! 25.It is easier for a camel to go through the eye of a needle than for a rich person to enter the kingdom of God.” 26.And they were exceedingly astonished, and said to him, “Then who can be saved?” 27.Jesus looked at them and said, “With man it is impossible, but not with God. For all things are possible with God (Jesus Christ)” - Mark 10:21-27

If he would have called again Jesus Christ as "Good Teacher" and said, Yes! God alone is Good! that was the reason i am calling you as Good Teacher, He would have inherited the eternal life.