I wouldn’t allow personal attacks or namecalling towards anyone but me. If two or more people were squabbling incessantly in inappropriate and disruptive ways I would deal with it, first by talking to them, then probably confining it to its own thread, then banning them if it came to that. People would be free to question any and all decisions I make without limit, I just can’t see that bothering me. They would also be free to question any decision I don’t make.