From such experience, this might be a fruitful approach to trying to shift the gender imbalance in the community. It's unfortunate that describing oneself as a rationalist can have the potential to come across as having a superiority complex, and doubly unfortunate is how common-place is the meme of rationality being a "men's" thing (all women are slaves to their bleeding vaginas, amirite?)

A possible consequence of this is that, when it's phrased explicitly as such, the idea of a "rationality community" conjures up images of boorish men talking about how "you're irrational if you get offended when I say women are sluts who always cheat! IT'S SCIENCE!", which is not at all an inviting atmosphere.

Stuff like that is something that does itself need to be combated, but in the meantime, books like GEB perfectly illustrate how whimsical and fun - AND WELCOMING - real rationality can be, introducing important concepts and making the reader feel brilliant and excited to learn, without the triggering the defensiveness that can occur through the implication that, if I want to teach you rationality it must mean I think you're "not good enough" the way you are.