Here is Bart Ehrman most recently on this subject:
And [Jesus] talked about someone else, rather than himself, as the coming Son of Man. ... His message is about the coming kingdom to be brought by the Son of Man. He always keeps himself out of it. ... I have already argued that he did not consider himself to be the Son of Man, and so he did not consider himself to be the heavenly angelic being who would be the judge of the earth.
Against this Mark 2:10f is plain enough:
But that ye may know that the Son of man hath power on earth to forgive sins, (he saith to the sick of the palsy,) I say unto thee, Arise, and take up thy bed, and go thy way into thine house.
Of course, Ehrman evidently discounts the authenticity of this and similar sayings on the grounds of their character as miracle stories, but as Albert Schweitzer taught us long ago, the thorough-going eschatological interpretation means that we can accept the presentations of both Matthew and Mark pretty much as they are without doing serious violence to them.
Of course, there are other self-referential examples which are not miracle stories.
And it came to pass, that, as they went in the way, a certain man said unto him, Lord, I will follow thee whithersoever thou goest. And Jesus said unto him, Foxes have holes, and birds of the air have nests; but the Son of man hath not where to lay his head.
-- Luke 9:57f.
To be clear, Ehrman is right to stress that it was God who would initiate the events of the heavenly appearance of the Son of Man to execute judgment on the world, not Jesus. Indeed, Jesus is completely passive in this regard throughout the Gospels (which incidentally completely nullifies the zealot hypothesis), and even right up to the bitter end, only giving up it seems on the cross: "My God, My God, Why hast thou forsaken me?" (Matthew 27:46/Mark 15:34). The problem of how Jesus still imagined himself in this role of Son of Man even as he tells the high priest at his trial that the high priest would see the Son of Man coming on the clouds remains nearly insoluble, not to mention that the subsequent Johannine interpretation and the presentation of the exalted Jesus in Acts performing the comparatively most trivial, even superstitious, divine interventions completely reject it. But the value of Schweitzer's original conceptualization is that Jesus thought this way at several points during his ministry but remained undeterred by events which showed him that he was mistaken, especially early on in Matthew 10 when he thought the end would come before the disciples had finished going throughout Israel on their mission trip (an expectation by the way which is completely incompatible with a suffering servant of the later passion narrative and for that reason absolutely remarkable for its survival as witness to Jesus' original self-conception). And then it seems Jesus expected it again on his triumphal entry into Jerusalem, only to be disappointed again, and then in the Garden of Gethsemane when he boasts that he could call down the heavenly legions, and then finally at his trial. But in all instances Jesus holds himself back as it were, dare we say it, the way only a crazed fanatic does when faced with the immediate improbability of his own false expectation.
There is more than a hint of mental illness in all of this, which many people suffering from bipolar disorder will instantly recognize. And we can see Jesus' progeny in the many end-time enthusiasts of our own time, whose message often attracts a certain sort of personality.
It is not meant as an insult to someone worshipped as a god, nor to his worshippers.
Desperate times produce extremes of their own, for which we should above all show compassionate understanding.
