The apparent inconceivability (in this thread) of the notion that someone might disagree on a deep level with local memes without being insane is quite amazing. [...] If you're serious about working for all of humanity, it may conceivably be useful to seriously listen to some who don't already agree with you.
I don't think that's the case. If people would find that notion inconceivability I doubt that the thread would be upvoted to 19 at the point of this writing.
I would also point out that the kind of ideology that expressed in the linked post comes from the Bay Area. As far as core differences in ideologies goes pitting one Bay Area ideology against another Bay Area ideology isn't real diversity of opinion.
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.