WTF?!? Your H takes the cake for being a stupid jerk!
My ex shed the crocodile tear and put on this woe-is-me act in front of S9's teacher while blaming me entirely for our S's behavior being called into question. It took every ounce of self-control in my being to be able to sit there and take her character assassination. But your ex, Karen, is just a coarse, stupid bully!
Do you have any adult male relatives who might could take your H out back, behind the woodshed, and keel haul his sorry butt (on dry land)?