It's in reply to Quinton saying that there should be no masculine and feminine types of rationality. In other words, whether you are a man or a woman should not determine what the correct/rational answer is to a particular question (barring obvious exceptions). This is in stark contrast to asking whether or not political affiliation should be determined by how rational you are, which is another question entirely.
In other words: Just because correct answers to factual questions should not be determined by gender does not mean that political affiliation should not be determined by correct answers to factual questions.
I think political differences come down to values moreso than beliefs about facts. Rationalism doesn't dictate terminal values.
A long blog post explains why the author, a feminist, is not comfortable with the rationalist community despite thinking it is "super cool and interesting". It's directed specifically at Yvain, but it's probably general enough to be of some interest here.
http://apophemi.wordpress.com/2014/01/04/why-im-not-on-the-rationalist-masterlist/
I'm not sure if I can summarize this fairly but the main thrust seems to be that we are overly willing to entertain offensive/taboo/hurtful ideas and this drives off many types of people. Here's a quote:
The author perceives a link between LW type open discourse and danger to minority groups. I'm not sure whether that's true or not. Take race. Many LWers are willing to entertain ideas about the existence and possible importance of average group differences in psychological traits. So, maybe LWers are racists. But they're racists who continually obsess over optimizing their philanthropic contributions to African charities. So, maybe not racists in a dangerous way?
An overly rosy view, perhaps, and I don't want to deny the reality of the blogger's experience. Clearly, the person is intelligent and attracted to some aspects of LW discourse while turned off by other aspects.