I can't believe people are giving Aysiu crap about this. Given how frequently I see she used as the singular anonymous third person these days, and certainly in computer books, I'm surprised that anyone can even manage to be irritated by it. And those that consider it PC should probably consider that they are the ones insisting on a convention, or a sense of 'correctness'; Aysiu, on the other hand, is not insisting on any type of 'correctness', or even insisting that anyone use anything other than their preferred third person singular pronoun.
Incidentally, the tendency to assume that one is using he as a singular, gender-neutral pronoun is often betrayed when it comes to referring to unspecified nurses, secretaries, and other roles that are conventionally thought of women. In that case, the normal anonymous singular third-person pronoun becomes she.