Mean teacher?

We have this teacher in our school everyone hates. We had this sub and she was very nice, but apparently something else happened. The other homeroom cl made her walk off the job this morning, she left and never came back. So, we had the teacher everyone hates. We got to Math (the subject she was teaching) and we had no idea wtf she was blabbing about. She said that WE were disrespectful and who do we think we are. She critizied us, and we didn't even do anything to the sub! We were the good cl! We never said anything to the sub. But that b!ch we had today said we were the ones who made her leave. Do you think she had a right to yell at us?