Fair point. I try to reach outside my bubble when I can, and do know and speak with tech workers who live outside SV (and outside the US), but my biases certainly show sometimes.
But I do believe that, even for an employer who might by sympathetic to some of this person's views, many will not want to take a chance dealing with someone who might be a liability in the workplace in various ways due to those views. Certainly writings on one's blog aren't a perfect indication, but I think most hiring managers would prefer people who keep their more extreme views under their hat. Whether or not this is fair is besides the point; I do believe this is the reality.
For the record, I think many companies would have the same reaction to someone who posts angry-sounding leftist rhetoric on their website. But I do expect many are more tolerant of that than angry-sounding right-wing rhetoric.
Beyond that, even without all the social and political views, I think things like "I'll only work in C" and "I'm bad at understanding other people's code" alone would disqualify a candidate for most jobs.