Just ignore them, they don't know what they're talking about.

[On the one hand, he can't disagree with any of that. He spends a lot of his time just learning and tinkering with stuff simply because he can, but he's not that bad. That, and of course...]

And what's wrong with my hair? [It's probably a good thing Lumina can't see that he's busy pulling at it to see what's wrong with it. He doesn't care, necessarily, but how does that tie into the dork-persona?] It's better than being bald and that's what counts.