Makes you wonder when he found out.
I think he does it to cover the fact that he's clueless on so many things, and yet, as a true narcissist, can't allow it to seem so (and may not believe it, himself). He likes to be the know-it-all (even if it's incredibly transparent that the opposite is true).
The king of debt, maybe.
...but hey, do what you want...you will anyway.