Yea, the little boy is stomping his feet trying to get mommy's attention. So now he is hitting you where he knows it hurts...saying things about the kids.
Do not engage.
I wouldnt send anything like what you wrote. He wont remember that about last year and right now he cant hear anything.
So,you are going to see more anger. Too bad. So sad. Not your problem.
He doesnt get to come in, turn your life around AGAIN and then stroll out like he didnt do it. Frig that.
