It entirely different from you as a parent gambling around your kids, as opposed to your teacher. If anyone else had a 16 year old daughter, I would worry what else this loser is up to if he is doing it in class. Like someone said go to the bathroom, i'd be pissed if a teacher did that in front of my kids in the middle of class.
And as far as snitching, ok, say he has sex with your daughter, would you not snitch then, ridiculous statement, they are in an authority position paid by my tax dollars, I expect a bit more.