I didn't say don't do anything. I said make your complaint respectfully to those in charge. What I meant by don't do anything to him was don't do anything directly to him. In other words, just leave him alone. Doing something to someone who isn't doing anything only invites trouble. I've been in situations where the only thing I could do was tell someone in charge what was going on and then ignore the person that was causing the problem. I got the satisfaction of him giving up because he got no reaction. Seems to me that the person in question isn't doing anything wrong while in the classroom. So the only problem is that he's there and left to his own devices. Which brings us back to, make the complaint and if nothing happens you've voiced your opinion and can go on with your life.

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"BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Will he offer me his mouth? BOY: Yes. GIRL: Will he offer me his teeth? BOY: Yes. GIRL: Will he offer me his jaws? BOY: Yes. GIRL: Will he offer me his hunger? BOY: Yes. GIRL: Again, will he offer me his hunger? BOY: Yes! GIRL: Yes. BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Yes. BOY: I bet you say that to all the boys!" -Meatloaf