I'm sorry you are in the throes of a D and your stbx is displaying some of the similar behaviors as mine. It is sad, but you do have to try and ignore as much as possible.
I'm still guilty of engaging her, but lately, I've been more apt to call her on the carpet for things if I'm going to contest anything at all. She usually backs down when she realizes she's wrong.
However, I do look to pick my battles and I'm trying to stay cordial and polite when I see her and her new BF. In fact, in one of our last correspondences, I asked her if she realized how rude her and BF were to me when I exchanged D and if they truly believed that D didn't notice. XW's reply was "We've been in a hurry to get to places after we pick up D."
In such a hurry you can't even say hello? I've asked her this question but haven't heard a reply. There is nothing I can do that will make my XW less angry, but my questions are really for me to get them out of me, so not only do I expect to hear from her, but I don't really care to either.
Take care and I'll hopefully hear back from you soon.