The gender of the original author is irrelevant.

There's no evidence that women are less sexist than men. In fact, all the evidences is that women and men discriminate equally against women:

http://ideas.time.com/2012/10/04/womens-inhumanity-to-women/

Of course, this does show the flaw of trying to judge the gender of a person by how they present themselves online; while on average men and women may show small differences in communication, there are of course many women that communicate in a "men's" manner and v.v.