I think the outrage more comes with people acting like their life is more superior just because they chose to have not kids and spend their money on themselves, rather than just not choosing to have kids. Usually stuff like this is trying to rub it in people's faces.
I don't understand why either, but I have met people who act like it's some kind of personal offense when someone tells them that they don't have and/or don't want kids.
My whole family including aunts and uncles laughed at me when i said i didnt want kids. Not funny laugh but the "oh you young naive little girl" kind of laugh.
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