Parents in those countries choose male children because male descendants are better for the parents. A girl in these countries is seen as a burden. She must be

Parents in those countries choose male children because male descendants are better for the parents. A girl in these countries is seen as a burden. She must be taken care of, and then hopefully married off, so that the husband will take over the burden. A man on the other hand, is supposed to, by cultural standards, support his parents their whole life. This is something you and the parent poster seem to miss. And also why "getting rid of all men" would probably have the opposite affect on society as you proclaim. Frankly, you're a fucking idiot, and it's about time someone told you that.