Back in my English classes, The Elements Of Style was our bible. It says that singular-they is not correct, and that "he" is the correct pronoun for a subject that could be of either gender.

So, if someone were to argue, "we should switch to singular-they because 'he' is old-fashioned", then sure, I would totally be on board with that. Something I didn't know until today, is that singular-they is actually a pretty old idea with a lot of precedent.

But some people (like Joyent) seem to be saying, "anyone who uses 'he' instead of 'they' is being sexist," which is just going totally overboard. Lots of well-regarded style guidelines say the opposite, so quit with your witch-hunt logic.