I believe, in this context, that he's not dismissing the reality of sexism in Silicon Valley so much as suggesting it's not worse than other industries but getting a lot more attention than other industries right now. The SlateStarCodex post he links to [1] is really worth reading and makes the same point more effectively.
[1] http://slatestarcodex.com/2015/09/16/cardiologists-and-chine...
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