Why is there a feudal idea of "son preference"?

I feel "son preference" from my best friend.

When his daughter was in the preparatory class, he had a second child, a boy. The reason given is that the gender is male, which is a pity. Wait until the baby is born. Since then, the circle of friends of both husband and wife has been videos and photos of their sons. That year, his daughter's grades dropped from eleven to one hundred. The reason is that I think my parents will have a younger brother who doesn't love himself.

That's what happened. I once asked my brother such a question. I said I remember you were strict with your daughter when you were a child. Why are you so tolerant of your son? The answer he gave me was that my daughter was stubborn and never relented. As soon as my son started, he began to beg for mercy and kiss up. He thinks his daughter has a bad temper and his son is smooth and clever. Is it true?/You don't say.

When I went to Disney with my family. There is such a detail. At first, I was with my buddy and his daughter. But after playing the first speed light wheel project, my wife called and said that my son wanted to go to the toilet. I never came back after the past. And then play with his daughter until the afternoon. For four hours, neither he nor his wife showed up. Although I am very happy with his daughter. The little girl has always been very polite. Always refused me to buy her this and that. Follow me like a tour guide. Even when a girl took the initiative to ask me for WeChat, she smiled and deliberately called me dad. I think she should care less about her parents and more about her younger brother. But at night, at the Disney Fireworks Festival, when the first fireworks bloomed in the sky, she suddenly pulled me excitedly and pointed to the distance and said, Mom and Dad are there. I asked her if she wanted to go there. She suddenly smiled awkwardly and said, no, I don't want to disturb them. At that moment, I suddenly felt very sad. But there is nothing you can do. Just like being a woman, even if you know that you prefer boys to girls, there is still nothing you can do. The most ridiculous thing is that some parents always tell their daughters to be grateful, filial and content, but never say the same thing to their sons. You see, even brainwashing will give preference to boys. Is it funny? No, it's the same online. When I once said that "every woman is basically a survivor of the net of son preference", some even said that I led this war. Someone will give me a boxing hat so that these facts will disappear as long as I shut up? . And in fact? Men who prefer boys to girls will never admit their partiality, but will only say that you are melodramatic and have no connotation. What a family destroys you is often not the next generation, but feudal thoughts. Just like in Disney, he, his wife and his son had a carnival, but they forgot their daughter's loneliness. In many cases, parents pretend to turn a blind eye to their daughter's situation. Preference for boys is probably that the eyes will never see the daughter's pain, and the eyes are full of all the trivial things of the person who is valued. My daughter will always be like an invisible man in this family, harmonious and harmonious. You can only look at their backs like a bystander.