These comments are largely directed at a straw-man, and in many cases actually agree with the memo, when they think they disagree.

"I disagree with...his arguments pointing to biological factors as a primary reason that there aren’t more female software engineers"

- straw-man - he argues that biology may in part explain the lack of 50/50 representation. from the TLDR: "Differences in distributions of traits between men and women (and not “socially constructed oppression”) may in part explain why we don’t have 50% representation of women in tech and leadership"

"I disagree completely and utterly that the (yes, real) average differences between men and women map to being better or worse at certain jobs. Interest in certain jobs, certainly."

- you actually agree with the memo. From the memo: "Women generally also have a stronger interest in people rather than things, relative to men...These...differences in part explain why women relatively prefer jobs in social or artistic areas"

"It seemed like he cherry-picked research that agreed with his views and didn’t seek dissenting research or opinions before sending the document to internal Google groups."

- The purpose of posting this memo was to seek dissenting research and other opinions.

"differences are so significant as to suggest that men or women are better or worse on average at any job that relies on mental work."

- straw man. men or women being "better" is not the concern of the memo.

"his skepticism of his own views deserves a much more prominent placement in the text than a footnote – had he led with this and made it clear he wasn’t sure whether he was correct and simply wanted to start a discussion (as he subsequently stated in a YouTube interview), he likely would not have been blasted the same way."

- the first "background" paragraph literally is this.

"Google has stated many times that its efforts involve focusing more resources on searching for candidates in minority groups rather than lowering the bar for these groups. Such misrepresentation is harmful to those of us at Google who have to overcome the bias that we were hired based other factors beside our skills."

- the author is also concerned with harm to female employees in the form of increased tension resulting from hiring practices that are perceived as lowering the bar. Google obviously would not do this intentionally, but the author felt the practices "effectively" lowered the bar.