Go read what he said. It's pretty obvious unless you're one of the ones looking for a fainting couch every time he opens his mouth (and, I know you're not).
I went back and re-read the article again. With keeping in mind the thought that he was just joking as suggested, I could only conclude then that he was just being his narcissistic self.
It is very sad that we have a President that we have to assume that he's joking, trolling or is going to back pedal on what he tells us.
I have tried very hard to overlook has narcissistic and even sometimes childish behavior, but when he makes comments like this, it becomes difficult; especially when comments were made like this before about his predecessor.