While I've never gotten the text message meant for someone else which bashes me (and oh, that would be just lovely if I did), my X has informed me outright that I don't have the child's best interests because I've made a counter-proposal, or suggested that we speak to a court ordered and court appointed mediator to decide what IS best for her, and didn't just jump to do what HE wanted/suggested/asked.
It was a dynamic in the marriage that I had a tendency to give in to the bully pulpit to keep the peace. Having broken free from the relationship, I don't have to do that anymore, and don't have to feel guilty about it either.
People like that self-destruct over time. It's a matter of giving them enough rope and letting them hang themselves.