Earlier quoted context omitted.
Then please go read it. I personally was surprised at how careful and level-headed it was. But due to space constraints his message is often dumbed down by the media to "google employee has said that due to biological differences women can't become decent engineers" which then gets the response it gets.
I read it on the advice of your comment. It is neither careful nor level headed. The whole thing is a motte-bailey between differences in statistical group averages and individual hiring decisions. http://rationalwiki.org/wiki/Motte_and_bailey If there's such a large overlap between populations, as he claims in the first couple pages, why bother enumerating those differences in such extreme detail?
Small initial differences are capable of causing great divergences down the line so discussing them is not pointless.