If I may be so bold (and rude)...
Being a SAHM, especially one who never plans to work, isn’t contributing anything to society. Sure you are bringing up your children but it would be hard for regular folk to argue whether the personal benefits of that outweigh the benefits to society.
Certainly none of the SAHM that I know are doing anything outside of paid work to contribute. Nor do the majority of folk I know who are in paid work. That doesn’t mean you never will in your lifetime.
So you are posing a philosophical question: does everyone in the world have to be contributing to society? Does it matter? Do our contributions have to come solely from the paid work we do?
But please be assured I’m not trying to be nasty and I’m not judging you, I’m very “live and let live”. All I’m doing is suggesting a reason that there may be judgement from others. Or why the whole idea of a SAHM doesn’t sit right with them.