The preference for a male child over a female child is not limited to what you dub to be 'sexist societies'[1] (thus inadvertently revealing your selective antagonism towards the said societies--India and China). It is actually global phenomenon, the USA included: https://en.wikipedia.org/wiki/Sex_selection#Preference_for_s...
> If you really want to fix humanity, I'd advise getting rid of men.
This strange advice of yours depends on the fervent belief--a sexist one, I might add--that women are incapable of the wiles of humanity.
[1] It would be far more reasonable to suggest instead that this preference is but the other (evolutionary) side of men being the more expendable sex (i.e., the more expendable they are, the more of them need to be birthed to account for their greater number of deaths)