Sandra tells her that he needs to be taught a lesson, she doesn't deserve that kind of treatment and he'll just keep doing it until he sees there are consequences for his actions.
So what does he say, does he want to have a little fun? Dane ends the conversation with a final insult, telling her to go back to studying since books are the only thing that are as dull as she is.
What if his sister comes looking for her? He makes fun of her glasses.