How does Kumalo treat the pregnant girl when she reveals she has had two other “husbands,” and why?

Kumalo is disgusted by what he perceives as the pregnant girl’s lack of morality, and he lashes out cruelly at her, asking her if she would also sleep with him since she has had no qualms about promiscuity before. He purposefully makes her feel like a common prostitute rather than having compassion for her difficult childhood and lack of moral guidance from her parents.