I'm going to go with Tori. Both of them were very wrong. Jade shouldn't have been a bully. However Tori didn't just stand up for herself, she went beyond that. She already GOT Jade. She beat her in the alphabetical inprov. That was already enough to humiliate her. Being beaten দ্বারা an amature is pretty embarassing. But no, Tori couldn't just hit her once, she had to go below the বেল্ট and hit again. How dare she insert herself into Jade's relationship. She SAW how insecure Jade was about Beck and she used that. Premeditated. Cold. If I were Jade, that would have caused SERIOUS problems in my relationship. Beck and Tori were wrong to have done that to anyone.
Actually, I think the worst was Beck. I mean, his girlfriend was sitting right there and he knew that these girls hated eachother. I dont care if it was just improv, all three of them were wrong.