How does Josh shut Tia up when she is complaining about being a assaulted in a club

When Tia arrives at school with a bandage on her arm, she claims to have been attacked at a nightclub. She then tells her friends that her father “predicts Anglo-Australians will be extinct in this country soon”. Josh quickly shuts her up when he replies that she is sleeping with so many men that she will be able to repopulate the world herself.