Let it go. (Easier said than done, right?) But the fb msg to the kids shouldn't interfere with your life. When you catch yourself harping on his st@pidity, think of something else. I tend to think about myself and what can I do to improve my peace of mind.
Take care!
M 42 H 39 T10 (-2yrs separation) S8 D5 DD 7/30/11 (EA&PA) Reconciled 6/2013 Separation in works 1/2017