TBH I doubt this very much. In fact I doubt, in general, that such broad assertions can even be made. Anecdotally, I have worked at 2 research labs by now (one of them was MS Research, another relatively unknown), and of the few truly genius-grade people I met there none really had much "humility" on display. They know a staggering array of stuff really well, and they know they know it. If you don't know something, they'll let you know without much consideration for your self-esteem.
Unlikely. My bar for a "genius" is pretty high. It's actually pretty obvious when you're in a room with one - it almost feels like they're different species. Stuff that's insurmountable to you is easy as a pie to them, and they can explain it in simple terms. They couldn't care less about the fact that you weren't able to understand it on your own.
And some of them present very modestly most of the time, but if you're wrong about their stuff, they won't mince words. Nor would they be humble about things to get along with you, or doubt their knowledge just because it's trendy to do so. They don't necessarily shove themselves into everyone's face.
