I sometimes hear furries mess up and refer to women as "female humans" or something along those lines, but that's mainly because furries usually think in "male/female" instead of "man/woman" (or at least all the ones I've met seem to). For an example, "Cat-woman" can be kinda ambiguous and (at least imo) sounds kinda odd since "woman" is usually exclusive to female humans. In this example, are we talking about a woman who's obsessed with cats, a woman who is a cat (a female feline with human features), an anime cat girl (a woman with cat features), or a DC Comics character (a woman who dresses up like a cat)?
Otherwise though, yeah. Yeah, especially, especially when someone refers to women as "females" as in "check out those females over there". That's creepy. Even furries would rather say something like, "check out those gals over there", regardless of context.
Edit: also, does this hypothetical person say "males" too, or is it "man/female"? "Man/female" is a massive red flag.
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.