The term "Cat" simply implies that you are cool or hip. for someone to refer to you as a "crazy Cat" they are giving you respect for something you may have done that is cool or hip, that they themselves would never dare do.
when someone declare that you are mean, he/she means that you are not nice or you did disappoint her/him at the point or action been made from you.Hope you are clear now.
It means their too passive-aggressive to speak for themselves. Perhaps they were raised not to be "selfish" and this is their way to get around that. "I say 'we' because I'm speaking for the group-...