You may not be, but I don't see that as "disjunct"
What seems confusing about it?
I see a LOT of anger and resentment in your post. I don't see nearly as much in his response. I see him admitting that he doesn't see a reason to wait for you to leave if that's your plan anyway. i.e. if your mind is made up. He sees it as a problem for your son to see that kind of interaction as "healthy" when you all know it is not (his perspective). He is not indifferent in the least. He is frustrated though. He realizes he is not able to communicate with you but doesn't seem to know why.
Would it help to put that in ascii? Or Cantonese?
Maybe I'm nutz though
AJ
"Our lives begin to end the day we become silent about things that matter" MLK Put the glass down... "Yesterday I was clever so I wanted to change the world Today I am wise, so I am changing myself."