Every time they confuse his meaning his reply only makes it clearer to the crowd that he is divine. So they only end up help him by their heckling to make his point even clearer.
This is a challenge to all of us. Where do you stand? Are you above, or below? Are you of God – because you’ve sought him and found him – and there is your heavenly home, and he is your Father, and Christ is your Saviour, and the Holy Spirit is the One who will keep you close to Him? Are you from above, as it were, born from above? Of are you from below, altogether of this world, altogether for yourself, and fleshly, and the things of this world? And the Lord begins to teach them these concepts once again.