As a woman who is bothered by the “females” thing, “female humans” doesn’t sound bad to me. It’s because “female” is used as an adjective here. It’s the same reason “black women” sounds fine, but “blacks” sounds bad. It’s reducing someone to their gender only, as if they’re not humans, too. It feels otherimg.
You might be right.
Source: https://whynow.co.uk/read/who-is-funding-just-stop-oil-the-billionaires-backing-the-art-vandals