I personally love Perelman's story. I think many (most) people have a
very difficult time understanding motivations that differ from their own. People are amazed Perelman turned down a Fields medal
and a Millennium Prize, they can't fathom any
sane person doing that.
Similarly, people can't fathom why _why decided to do what he did.
I think people are inherently uncomfortable with people who live in a way that appears to contradict or call into question the very goals that the uncomfortable people are themselves pursuing with such abandon.
Perelman turned down a sought after prize (two of them) and _why ducked out from a kind of localized fame/recognition that a lot of developers crave. It calls into question the value of these kinds of rewards/goals, and not everyone is comfortable with those thoughts.