Do I believe that one can in good faith believe that current concerns about sexism are a witch hunt? (Note that "hysteria" is an unfortunate word choice here in that it was an imaginary disease used to smear women for centuries, and the name itself is rooted in the notion that having lady parts makes you crazy.) Sure, I guess. In the same sense that I think one can have a good-faith belief that anthropogenic climate change isn't real. In both cases I think some are consciously acting in bad faith. But I think the bulk just don't know enough about the topic to have a valid opinion, so they run with the one that's politically and/or personally convenient for them to have.
As a guy, I get it: the shift from thousands of years of male domination to something more equitable feels like a loss. We quite literally didn't have to think about how women would take things. Now suddenly our speech and actions are having consequences they didn't used to have. It's easy to feel that we get in trouble for saying "normal" things. But it didn't work the other way: women always had to be conscious of how men would take what they said.
The system of beliefs and behaviors that punished women for speaking up and speaking out is on the wane, but as we see with Kathy Sierra, it's still powerful. Until it's destroyed, I think everybody has an obligation to help end it, or at least stay out of the way. And when people do things that look a lot like supporting and continuing that system (as Michael did here) they should not be surprised when people do not look charitably upon that.
Specifically, I think it's reasonable for Uber executives to take exception to their company being characterized as misogynistic. I don't think taking exception, even strong exception, to these accusations is a misogynistic act in itself.