A little knowledge is a dangerous thing, not sure what the official name for this particular cognitive bias is (feel free to enlighten me). Probably most of us can recognize that feeling of enlightenment after learning a bit of something new and exciting, and not realizing yet how far it is from the mastery of the subject. I suspect that learning the LW brand of rationality is one of those. (Incidentally, if the words "LW brand of rationality" irked you, because you think that there is only one true rationality, consider how close you might be to that particular summit of Mt. Stupid.) See also the last bullet point in the linked comic strip.
As an exercise in rationality, I suggest people post personal accounts of successfully traversing Mt.Stupid, or maybe getting stuck there forever, never to be heard from again. Did you find any of the techniques described in the sequences useful to overcome this bias, beyond the obvious of continuing to learn more about the topic in question? Did you manage to avoid turning Mt.Stupid into the Loggerhead range?
My example: I thought I was great at programming fresh out of college, and ready to dispense my newly found wisdom. Boy, oh boy, was I ever wrong. And then it happened again when I learned some more of the subject on the job...
I remember realizing not too long ago how silly I was being after just having read the Quantum Physics sequence here. I would watch popular science shows and have to have a little rant about how they were ALL WRONG! (Though I still admit any given popular science show can say some silly things) I realized every time I went to explain how they were ALL WRONG I would just say some secondhand (at least) and very opinionated ideas, and realize I didn't have very deep understanding from all that. But I would keep going.
So I've decided to stop, because it's irrational and at least a bit annoying I'd bet.
I think this is a pretty universal Rule of Stupid for me. Many things that I read about and opine on without actually doing, I later learn enough to feel embarassed about. I've gotten a bit quieter about pieces of knowledge I haven't used to accomplish something.