Most of the rest of the above comment seems to be insults accusing the author of bad faith, but this bit implied a question of fact:
The summary at the end hints that it was a use of word "eugenics" somewhere on LW, or maybe somewhere on some LW fan's blog.
We already practice eugenics, every time we do a genetic test and abort a fetus when it has some horrible transferrable genetic disorder. Frankly, we could do with a bit more of that - there are many, many horrible recessive genetic diseases which people should never have to endure, and which should be eliminated if at all possible. Not doing so strikes me as similar to not trying to cure polio.
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.