Jesus gave up equality with God when He emptied Himself and submitted to being a man (Phil. 2).
In this sense He became the Son of God, and could say while on earth that "the Father is greater than I."
Yet, God has highly exalted Him back to His own right hand, equal in divinity again.
What a wonderful mystery of humility!
Luke reveals Him as "the Son of Man" to emphasize His humanity.
But what does it mean?
As a man, Jesus was tempted and suffered in all things like we do; and now, having returned to the perfect unity of the Godhead, He brings our suffering into the divine fellowship so that He is touched with the feelings of our infirmities.
As a man, Jesus experienced all the joy, sorrow, anger, frustration, loneliness, despair, rejection, betrayal, persecution, abandonment, and even the sense of being forsaken by God that we sometimes feel.
As a man, Jesus felt all the weaknesses of flesh and blood: hunger, thirst, fatigue, pain, temptation - and when they beat Him, He bled the same as anyone else would bleed, refusing any divine intervention that He could have easily called for!
And if that was not humility enough, He even accepted the ultimate identification with the human experience: He died.
Jesus did not just become a man and live forever like a superhuman version of man, but died a terrible and painful death on a cross.