That may be true, and if it truly IS a battle that can't be won, my next move would be a new doctor. And he says that as if it were an easy thing to do :-)
But hang in there, 'cause whether the doc wants to admit it or not, you ARE "the BOSS".
In fact, here's a thought. If the doc insists on being the boss, then as the "underling who was looking for a job when this one was found", tell him/her what you think of his/her performance. You may get fired and that may be a GOOD deal.
Hang in there BOSS, we shall overcome!