I don't think hyori is mean! She really cares about all the members she is just trying to make the show better! Honestly if hyori wasn't on this show I would not watch it!!! If you read the comment she wrote about how worried she was of daesung when he got in the car accident and killed a motorcyclist you would see how much she cares about them all. All of the members and guests know that she is joking or else they wouldn't work with her!