Social value is based on attraction. If a woman feels ashamed of her husband being a nurse, it's because, since most people don't feel this is attractive, society doesn't feel it's attractive. She has chosen a partner that most women would reject as he has low income, making it hard to provide for her children, and is concerned with nurturing rather than competition, which is an undesirable trait for her male children to have.

There is absolutely nothing wrong with wanting a partner who has social value, and you have no right to shame anyone for their biological desires.