That's important advice. Every child should be taught self-reliance. Not only girls but boys, who otherwise might expect "mommy" to wait on them for life.

This is the damage sexism does to humanity: not only are women hollowed out shells of who they might have been, but men are never forced to grow up. People who believe certain groups are inherently inferior will mistreat and oppress them, and that's pretty much the history of our broken world.