Mike,
I agree sometimes students are unhappy about something, and the classroom can be an outlet for their frustration, if we let them. I try to curb those behaviors as soon as they are observed by talking with the student in private, laying out my expectations, and coming to an agreement about what is and is not appropriate behavior. If the student is willing, I'll also listen to their personal difficulties, but only if they're comfortable sharing. If they are, I my offer suggestions, and in some cases, just having someone to talk to can make the difference between frustration… >>>