Yes, agreed. He seems to regard life as a zero-sum game, in which he can’t win unless someone else loses, so he doesn’t understand the concept of win-win. It’s a kind of cognitive bias which is a serious weakness in someone who apparently imagines himself to be a master of ‘the art of the deal’.
My 5th birthday. I had mumps, but my mother had already organised a birthday party for me, so I lay upstairs, confined to bed, listening to a roomful of other kids having fun downstairs.
This was a very long time ago, before children were routinely given the mumps vaccine.