"Son of Man" is used to show tthe divine authority of Jesus. It doesn't mean he was 'only' a man and therefore not divine.
Daniel 7:13-14 “I was watching in the night visions, And behold, One like the Son of Man, Coming with the clouds of heaven! He came to the Ancient of Days, And they brought Him near before Him. Then to Him was given dominion and glory and a kingdom, That all peoples, nations, and languages should serve Him. His dominion is an everlasting dominion, Which shall not pass away, And His kingdom the one Which shall not be destroyed."
The Ancient of Days is God the Father. The Son of Man is Jesus. Thus the Son of Man is a heavenly person who descends to the world and whose principle role is judge of this Earth and rule over a new Kingdom.
Mark 2:27-28 "And He said to them, “The Sabbath was made for man, and not man for the Sabbath. Therefore the Son of Man is also Lord of the Sabbath.”
Again this speaks of the divine authority of Jesus over the Sabbath.
Matthew 9:6 (Jesus speaking) But that you may know that the Son of Man has power on earth to forgive sins” —then He said to the paralytic, “Arise, take up your bed, and go to your house.
Only a divine being can forgive sins. Again Jesus shows his divine nature.
So yes although 'Son of Man' sounds like he's saying he's a mere human, on closer inspection he's asserting his divinity.