Sounds like you two need a lesson in what sexism looks like.
Oh, look. It's these same arguments all over again. Yaaaaay.
Yes, obviously men and women are different... but we don't need them to be treated as differently and as blatantly sexist as they are in this game. If all the female characters dressed more like and had bodies more like actual female MMA fighters I wouldn't be so annoyed, but here we are.
I feel like this is a great litmus test for character designers in general.
If you're not designing an R-18 game (and to be clear, everyone that isn't Netherrealms is clearly trying to avoid that M-rating), then you should be asking yourself this for every female character you design: "If I show this to my daughter or to my mother, how would they react?"
Sure, they might not necessarily be your target audience, but you don't want to turn off a significant chunk of women and even men with dignity, either. Especially when we're talking about something pretty damn close to half the population here. (Inb4 "but women don't play games" claptrap. Sigh.) I shouldn't even need to explain this to people, but apparently this is going to be going on for a long, LONG time.