I hate slut-shaming period, but the problem I have is that he's doing this because he can't afford his tuition for the drama college they go to otherwise (something I can sympathize with because JESUS, TUITION). Like it or not, he's being forced into the situation, and Rachel was completely unsympathetic. Instead of giving him the support he would have needed in that situation, even if just as a friend, she decided to make him feel bad about himself.

Also, when she found out about Finn beating the shit out of him? She was happy that he cared so much.