Hi Marie,
You hit the nail on the head, challenging students do come in all forms, but you always confront the student privately, otherwise things may get real ugly.
Our students typically have a lot of issues that they bring to school with them, therefore you never know what is causing a student to behave the way he or she does. Talk to the student to find out what's going on.
It is important for students to realize the importance of professional behavior. Every opportunity I get to talk about appropriate behavior, I take advantage of it.
Challenging students love to be paid attention to, and if you give them a leadership role they tend to have very positive behavior.
If a particular instructor has a good rapport with a student, and you are unable to reach the student, have the instructor who has a good rapport with the student, talk to the student.
Patricia