What is up with the hate of having a daughter?

So I have a daughter, she is 2 months and she is my world! My cousin and I were having a conversation about gender roles. I told her how my big brother didn’t do shit at home but I was always cleaning and was told how dirty I am all the time. She lives in a home with 3 female and 1 male. The 1 male is her brother. She was talking about her, her sister and her mom clean all the time. I was like what about your brother? She was like honestly he doesn’t do anything. And I was like yeah that’s so infuriating to me how our moms let the boys get away with everything because cleaning and cooking is seen as a girls job. And she’s like to be honest though if I had a boy I would spoil him and if I had a girl I would give IT away. She said she’s such a boy mom and doesn’t like girls. That piss me off so much and I told her how offensive that is and she shouldn’t be saying stuff like that. My cousin is 35 and childless and I honestly hope it stays that way. I hope she never has a daughter and even less a son and daughter because that little girl would see how unloved she is. Nothing wrong with gender preference but when you mistreat the other gender, that’s trash behavior.