Notice that Trump dismisses his ability to craft a healthcare plan by using comparison. He is excused from creating a great plan by noting that "nobody" knew it could be so complicated. 
He has done this before. He has said that "no one respects women more than I do" and no one is less prejudice toward Jews than he is.
Why does he dismiss by comparison? It is because he is a narcissist. Even a narcissist has limits. His limit is "no one else".