i really hope that in the future he's a bit more reasonable than he's shown here.  just as everyone's has an unreasonable ex in their past, most have a stupid, make an ass of themselves over their ex moment, too.  so there's hope.  it's great you still get to see your stepson.  i wish you and your family well, and i hope and your ex get to the separate but calm stage soon.  you seem like you're there already, but he's got some dealing to do.