I understand what you are saying you wish for, with regards to having children together and such. But with all due respect, I think you may have lost sight of the fact that you are trying to be reasonable or expecting reasonable from him, but it is simply not possible. Think of him as being intoxicated. Even if he has not been drinking that day, I believe his mind is still muddy.
Thinking clearly, and in return acting so, is just not something that he is capable at this point.
I would suggest you try either: absolutely no contact (unless an emergency) or very limited contact (meaning, no snippy comments, as much you yearn to make them!)
You wish to knock some sense into him when you call him on his behavior, make him see how much of a dolt he is being, but this is a no-win situation.