Excellent points.

I observe this in regard to religion and it's memes, and I think it applies to the non-rationalist community generally.

I think most people will be averse to LW-style rationality as part of a general aversion to things that seem too weird...

It perhaps makes more sense to replace "too weird" with "too different from the cultural norm". Christianity, for instance, has very weird beliefs compared to what science and common sense tells us. Adherents persist in believing in large part to continue conforming to the cultural norm, despite it's weirdness.

The interesting question (to me) is whether someone who is not predisposed to enjoying LW-style rationality ought to pursue it if they seek to optimize their happiness. If you are a happy Christian who believes God is madly in love with you and can't wait to bring up to your mansion in heaven post mortem, then LW is going to be depressing.

Even if you're just a regular old None or agnostic who likes to believe in warm fuzzy concepts like "everything happening for a reason" and Karm and Serendipity, then LW's deterministic, magic-killing, purely materialist views are a bit of a buzzkill.

It is possible that rationality training is a net bad for ceratin individuals because ignorance really is bliss in many circumstances.