Yes. As soon as he went into defensive attack mode, that was your que to say: "I will not listen to this" and hang up.
Don't beat yourself up over it.
You'll get better with practice!
He did agree to keeping the children Tuesday. Once he realized the operation was going to conflict with the pickup time, HE was responsible for making other arrangements for the children.
Sometimes unforeseen events interfere with our visitation schedules. I have learned to be very flexible. However, I do not feel guilty when my ex has a change of plans. His plans = his solutions.