>> Gabriele Diewald, a linguistics professor at the University of Hanover, disagrees. "The generic masculine is not a grammatical must," she says. "Claims to the contrary are deliberate attempts to continue marginalizing women and other genders."

I mean that's technically true, since it's not even a must to have a number system or much in the way of color categories (or really anything except nounish things and verbish things), but it kind of misses the point.

Pretty bitter. It's a matter of convention. To color it a 'deliberate attempt' is a deliberate attempt to politicize normal linguistic conventions.