It's none of someone's business why unless you choose to volunteer that information, and needing to know why you've just been turned down is a massive low-self-perceived-status signal.

If asked in an honest (rather than a begging) tone it is a massive signal that they are a person seeking self-improvement.

Yes, this means that they have accepted that they have flaws, and therefore that their status isn't as high as it could be. But I don't see how that would be a problem?

Is it, in your eyes, better that someone accept that they are flawed, and seek to change that (by learning of their flaws, and fixing them) or that they believe themselves flawless?