No matter how close we are to our children, they can and do throw curve balls from time to time.
From what you have said, your sone obviously intended you to know before the rest of the world via mass media - it was out of his hands that you found out the way you did.
Looking dispassinately, as of course I can, I think this was done with lack of thought, rather than intention to hurt, so you must do as you are doing, climb over it, and accept it for the error in judgement that it was.