"Um, all I was saying was that women and black people are underrepresented here, but that ought not be explained away by the subject matter of Less Wrong. What does that have to do with my cultural background or the typical mind fallacy? What part of that do you disagree with?"

To get back to basics for a moment: we don't know that women and black people are underrepresented here. Usernames are anonymous. Even if we suspect they're underrepresented, we don't know by how much -- or whether they're underrepresented compared to the internet in general, or the geek cluster, or what.

Even assuming you want more demographic diversity on LW, it's not at all clear that the best way to get it is by doing something differently on LW itself.