i hope the reason people dislike this is because its shit and not because its sexist or anything, cause its not lol.
There is a difference between a character being sexist and a story being sexist. In this case, I think the story isn't actually sexist because it punishes the MC for holding those views in the most ironic way possible and will have to force him to prove his own statements wrong if he wants to achieve anything in his new life.
Well, there is alot of reverse "sexist" mangas out there spewing toxic shit about men. Well no one complains ain't it?