I concede, FLTC - your wife takes the cake. Not one thought about your son's feelings in all of this. Just more shots at you. She seems to have regressed to about a Grade 2 level.
I would not want to win the prize for having the craziest ex.
The good news is that it won't go on forever - your son will grow up and you can finally stay out of the drama. The bad news is that she is scarring your son for life no doubt.
Focus on your new life and keep showing your son the kind of man he should aspire to be some day.
Hugs for all you're going through and wishing you stamina to continue.