I don't know, Alan. If somebody is acting up and acting out in a way that neither they (under better circumstances) or any reasonable person would support, the thing to do is to just let them have their tantrum without you being present, IMHO.
The thing to do when things are out of control is to state your boundary (e.g. "I am not going to discuss this until we can do this calmly") and leave.
OK, so when does the name calling start with that strategy? You've backpeddaled completely from your earlier position.
