While I'm not trying to pick apart small pieces of the essay, I agree with some of the high-level points. Culturally in SV, we are increasingly afraid of discussing anything that is controversial. Ad hominems are increasingly popular for any dissenting opinion or difference of view.
It wasn't always like this, and it has definitely gotten worse IMO. Based on conversations I've had with some friends, they also agree. We've all been living in the bay area for over 6 years and we're now entertaining the idea of moving away. I also know some smart people who have left naming this as one of the reasons.