I am a recent college graduate with a new job in my related field of study. The person assigned to show me the ropes is sending mixed signals. This person seems to enjoy complaining and critcizing others. If the comments are not directed at me, they are directed at another co-worker. This person suggests I perform a specific task, and I follow the suggestion, then this same person asks me why I did this. This behavior is very contradicting and frustrating. Why do some people feel the need to criticize and complain? Everything is fine one minute and when you turn around, this person's mood has swung the other way. Any suggestions?