Racism, sexism and homophobia are the three primary evils for politically correct professors. From what I've read of pick-up (i.e. Roissy's blog) it is in part predicated on a negative view of women's intelligence, standards and ethics making it indeed sexist.
See this to get a feel for how feminist react to criticisms of women. Truth is not considered a defense for this kind of "sexism". (A professor suggested I should not be teaching at Smith College because during a panel discussion on free speech I said Summers was probably correct.)
I've never discussed pick-up with another professor but systematically manipulative women into having sex by convincing them that you are something that you are not (alpha) would be considered by many feminist, I suspect, as form of non-consensual sex.
How comes they describe that in terms of 'convincing them that you are something you are not' rather than 'becoming something you didn't use to be'? Do they think people have an XML tag attached that reads 'beta' or something, independent of how they behave and interact? To me, the idea of convincingly faking being alpha makes as much sense as that of convincingly faking being fluent in English, and sounds like something a generalization of the anti-zombie principle would dismiss as utterly meaningless.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.