Hi Cathy,
Let me add my own, "that is so astonishingly lame!" to the Chorus going up from the board. i don't think I would have slept for a month after getting something like that.
The compassionate part of me, though, cries out for the poor child who is being raised by this jerk. His kid doesn't deserve to have to put up with the %$#@ that his father is probably creating for him. Maybe it would help keep you grounded to find some compassion for the poor little 6 year old. At least, your son gets to go home with a nice mom!