Facebook COO Sheryl Sandberg's new book, Lean In—a kind of workplace feminism manifesto—has inspired a range of reactions from critics. Some were positive; some less so. But none was as negative as the response Sandberg spokeswoman and former Facebook flack Brandee Barker had for Katherine Losse, an erstwhile Zuckerberg speechwriter whose rigorously critical take on Sandberg's book was published in Dissent this week: