I hate it when people call women “females.” I have one friend who does it because she was in the military and it was standard practice there, and occasionally I’ll say it when I specifically mean biological females rather than women, but 98% of the time it’s douchebaggery. Rule of thumb: if you say “females and males” it’s okay, but if you say “females and guys/men,” you’re probably a douchebag.
It really isn’t exclusive to misogynists: for instance the otherwise perfectly accessible bell hooks has the same completely annoying tic going the other way, and as Holly says they do the same thing to both genders in the military and, to a lesser extent, in police organizations.*
In the military or police it makes a little sense to put that layer of abstraction — it’s way easier to see or say (or, yikes, do!) when you can say something like “minor female down” rather than “a little girl is badly injured.” But whereas that sort of psychological separation might make it easier for soldiers, police, firefighters, or EMTs remain dispassionate in emotionally-charged situations, that kind of distancing is problematic in the extreme when you humanize one sex but “animalize” or objectify another.
At the very least it sounds alienated. At worst it sounds ominously creepy.
* While walking through a shopping mall I once overheard a mall cop pretentiously instructing a janitor that there had been some sort of disturbance “in the females’ restroom.”