Wait a minute, you're saying that talking about truth or rationality at all is suspicious? That'd be a pity. But now I understand the reactions of some of my acquaintances.
My mother, for instance often say that my philosophical views stems from a desire to control everything, or even plain fear (of death? of the unknown?). It looks like personal attacks (by dissolving the personal, historical causes of my beliefs, she dismisses the belief itself), but now I'm wondering if they're only rationalization for the bottom line "those beliefs are weird, and scary, and authoritarian and cold, and I don't like them".
Concerning Less Wrong's tagline, consider this plausible reaction of someone looking at LW for the first time:
And here are two real quotes from 2009:
And in reply:
The quoted text speaks for itself really. So therefore I think LW's admins/web designers should seriously consider replacing the rationality tagline with something more savory.