Megan did have a point. But Daniella and Gemma were circling like vultures waiting for someone to bully meant it escalated quickly and they wound her up. You can tell Daniella and Gemma used to be the school bullies and expect when they behave like this people will agree like sheep because they do in RL because they're scared of them.
I think an awful lot of this revolves around jealousy Stephanie's having an on screen romance and they're envious of the screen time this will get her.
I don't think I ever remember a single house filled with such vile unpleasant people. I like Tiffany and Chris can be okay, but the rest of them are absolutely vile, vile, vile.