A home is a place you feel safe. It takes a long time for Jack to find a safe place when he's in the Outside. No wonder he wants to go back to Room even though other people, including Ma, see it as a prison.

Ma is experiencing some culture shock of her own on the Outside. Even though Ma and Jack have lived outside of society for years and years, everyone else expects them to abide by their societal norms. Breastfeeding in public is weird enough to most people; breastfeeding a five-year-old is just unacceptable.

Jack doesn't like people staring. Who does? People think Jack is weird because he doesn't fit into a neat little bubble dictated by society—so they stare at him. But staring isn't polite at all. At least Jack isn't doing anything to make them directly uncomfortable.