Good play on the disruptive student. As a new instructor, I've found them to be 50/50 when it comes to valuable contributers. Usually their peers usually do a great job of providing feedback on their own about it. As far as the couple of times I've observed any kind of major unacceptable outburst, I have let it play out to an extent, and then expressed my position on the input they were giving at that time; and at that point I didn't have to remind them that our conduct greatly defines our character to those around us. And so as they experienced that awkward embarrassment, I downplayed any lash that they might have felt, reassured them that it's all good and we are all going through different things in life. After that I am sure to include them more, but make sure they understand that I attend to everyone else in class with as much priority as them.
