Ok, so I have seen loads of people complaining about the sexism in this manga. First of all, it is literally the main bit of structure for the storyline; it would be a completely different storyline without it.
Furthermore, the (main) reason that the world is so sexist is that MEN HAVE SUPERPOWERS and WOMEN DON'T. Evidently men are stronger in this world. I am not saying that it is right, but at least there is an actual reason.
I mean, if you really think that the prejudice in this manga is a problem, then just don't read it. It is clearly not condoning it, as the FL is acting against it and it has been disproved by most of the more likeable characters.