Right. Refusing beforehand to consider certain types of argument/conclusion without looking at their merits, and having freely-acknowledged yet apparently-not-seen-as-a-problem-and-even-actively-justified emotional reactions to those arguments that trigger that refusal[1], seem like exactly the sort of things this site -- or any community dedicated to generating quality thought -- would want to discourage as much as possible. And when the justification is given in the language of a thede/tribe/political movement/identity that is opposed to the types of argument/conclusion being rejected... well, creating/promoting/incentivizing those emotional reactions is very useful to the movement, but not at all conducive to generating quality thought.
(The fun part about all of this is that it looks like it leads straight to a version of Marcuse's paradox (tolerance requires intolerance of intolerance): you have to refuse to update toward refusing to update.)
[1] I've been calling this sort of thing a memetic immune reaction, extending the memes-as-viruses metaphor. The justification for it isn't always present, and the emotional trigger to the refusal isn't always acknowledged, so that blog post is really an excellent case study. (edit: whoops, asterisks are bullet points, can't footnote that way)
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.