Why? He called you out and he's 100% correct, why would it matter who he is? Personally, I think it speaks to his "personal image" that he doesn't give a shit about your feel-good CEO image demands. There's also no shortage of hilariousness that you think him taking a shot at you lowers his "personal image"; no harm done for telling the truth, you just don't see it that way because you're on the wrong end of it.
If I were shopping around for a company to invest in and I came across a comment like that, I'd be more likely to toss my money at him. You know why? Because I know I'm dealing with a person, not someone repressing all personal feelings and emotion to create this caricature of someone that they're really not. A person like that is more invested in their failures and successes, and, in my experience, is a better person to work for.
Becoming the leader of a company, as you know, is not a magic threshold after which you have to change who you are. I wish we'd get over this ridiculous assumption that we must hold people to a higher standard based on who they are. It underlies pretty much all of politics, and makes it a newsworthy event when Obama is seen drinking a beer. It's depressing.