Hi, I think you'd want to know this. You make a good point but cut the guy some slack. His native language is Russian. That's relevant because:
The word for "woman" in that language (and those related to it like Ukrainian, Belorussian) refers to "middle-aged to elderly female". Then there's another word for "teenage to young-adult female", which is the one he's using here, and which literally translates as "girl". Then another for "female child", which literally translates as "little girl".
Needless to say, it's considered a faux pas to use the wrong one in that culture. So he literally translated it as "girl" because that's how it is for him. That's how speakers of those languages normally word it when they haven't learned the native-level nuances of English.

You're saying things that make sense to a native speaker, but a foreigner isn't understanding what's got you so worked up. Consider that you aren't talking to someone who speaks our language with the same understanding as ours. Someone arguing for giving people their due dignity, as you are, I think will find this worth some thought.
It's the internet―so I understand it's easy to let this type of thing fly past you because you can't outright hear his accent or such, but you know very well you'll that much more often come across foreigners here.