This sort of situation happens in real world, even now, so I don't see how it is monotonous or adolescent if its a real issue. Just because you don't want to read about it, doesn't mean it doesn't exist. Also, Katana isn't really "having to struggle against that evil man who tells her should be a good little wife". She acknowledges that he uses his devil tongue as a weapon and trash talking an opponent isn't really derogatory.
Even if it isn't in this context, why is it bad to read about an evil sexist when superheroes deal with mass murderers all the time? Is mass murdering somehow better than sexist? If villains can be mass murderers, why not rapist or sexist?