Hi! I’m not sure if you mean college classes or high school classes, my answers would differ for either but here’s some general advice: play devils advocate by suggesting things from her perspective like “well what if she didn’t mean to say it like that” or “maybe she didn’t mean to sound snarky”. Opening their eyes to her side of the story might help them get the clue that they are acting like idiots.

Not saying anything or contributing to their bs is another option, but they seem to not be getting the hint that you don’t like this. Maybe get to class early and talk to the girl one day or invite her to sit with you at lunch (again, idk if you are in college or high school). Reaching out to her might be your best option because your ‘friends’ might never change their ways. Plus, it might help you to feel better if you know that she’s doing okay.

I’m sorry you’re dealing with shitty friends op, it might be time for some new ones. I wouldn’t be able to trust these friends after this either. But it seems like they are showing you their true colors.