As far as language goes, I absolutely agree that history and prescriptivism don't matter much. Where a word came from doesn't matter one bit, what matters are the common usages today and how they shape the way we think about the world around and within us.

I'd certainly agree that our culture has some misogynistic overtones ingrained quite deeply, no doubt about it, but at least to me the message of the original post doesn't ring clear for all of those words (keep in mind I'm not a native speaker). I certainly don't hear or feel a son in person and don't see much of the he in she. But I can absolutely see the male in female. There are a lot of things to work on.

Ironically, I do see some sexism in the Feminist Chewbacca statement on the matter that you quoted, but I really support the way madmaudlingoes handled it.