Wouldn't it be possible to minimize signaling given the same level of dispassionate discussion? That is, discourage use of highly emotionally charged/exosemantically heavy words/phrases if a less charged equivalent exists or can be coined and defined.
Say if you have a word X that means Y plus emotional connotation α and thede/memeplex/identity signaling effect β (not that emotional connotation is detached from the thedish/political/identity-wise context of the reader, of course), there's really no reason to use X instead of Y in dispassionate discussion. To give a concrete example, there's no reason to use 'sluttiness' (denotatively equivalent to 'sexual promiscuity' but carrying a generally negative connotational load, signaling against certain memeplexes/political positions/identities (though ideally readers here would read past the signaling load/repress the negative emotional response), and signaling identification with other positions/identities) instead of 'sexual promiscuity', which means the same thing but sheds all the emotional and thedish/tribal/whatever baggage.
(That shouldn't be read as an endorsement of the reasoning toward the same conclusion in the post, of course.)
I get the impression that we're already pretty much mostly discusing issues in a "less emotionally laden" way, avoiding shocking words,etc., no?
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.