Stop caring? [But give her a second because that one hurt, a reminder that he doesn't give a shit about her. And Dawn being Dawn, and the situation being what it is, she can't help that tears fill her eyes at the reminder.]
You know what? You're the one with priorities of the screwed up. You... you... peroxide brain damaged... something really mean that I can't think of right now cause I'm so... mad! [Or hurt and upset. Before any of those tears can fall in front of Spike, she's going away from him and back toward her sister. But before she's too far away she tosses a bald faced lie back behind her.] Whatever. You don't care, I don't care.