Really rude girls in my drama cl?

Okay, yesterday in my drama cl, there’s these girl’s, and they’re juniors, and they were being really rude to my two closest friends. Marie’s a junior too, and my other friend Christy’s a sopre, and I’m a freshman. Anyway, these girls in our cl were calling Marie a bitc.h every time she happened to accidentally mess up on a line or whatnot (we’re producing a new play). They talk about how much they want to beat her up, that they hope she dies and the list goes on…They’re mean to my other friend Christy because she said to Marie and I that they were being bitches and being rude (and they were!), so they then wailed on her. They leave me alone for the most part, and they’re only mean to be because I’m friends with Marie and Christy, but I’m pretty invisible to them. We can’t really go to our teacher and talk to her about it because she’s good family friends with those girls…so we’re just thinking about ditching drama for a day so we don’t have to deal with them…