If your son is 2 and you are going to coparent for many years , you should care. How did that communication style work for you during your M? It read like very childish communication and you say she was “fine” but I can assure you the way you carried that conversation on isn’t going to get her to stop nagging. And isn’t going to be help coparenting for many years to come . You say you appreciate her concern but you were very defensive and took it so personally.
But carry on. You don’t care, so carry on. I am sorry you felt criticized when I was trying to give some helpful feedback.