But the fact of the matter is that gender is a linguistic term with a hard meaning.
So is "etymological fallacy"For example, all languages have gender pronouns, [...]
Er, no.
Not even most, and
even of those who do, a large number don't use sex as a basis for assigning gender.
(Inspired by some statements in
http://www.diaspora-news.net/2010/11/29/im-dropping-diaspora-this-site-is-now-closed/.)