What am I supposed to do?

[kyoryu]

Just, you know, be careful. Deep-seated, vast psychological issues aren't playthings.

This. The self-delusion will protect itself. Evidence has no bearing on it.

If the whole world exclaims that his game sucks, it'll be either because they're too dumb to understand it, or because people have poisoned them against his awesomeness.

As I've said before, he sounds like someone that has no ability to see himself objectively, or understand that others have different ideas, needs, and knowledge than he does.