A boss that is willing to allow their staff to question them in certain situations is a good thing, it creates an inclusive working environment but only if said boss has the respect of their team. Back chatting is something else, it suggests a lack of respect for the manager by the individuals concerned. There is absolutely no point trying to surmise who this/these individuals are, it holds no purpose other than to sensationalise what is most likely just a build up of frustration and insecurity throughout the team.
For what it's worth though I would say it has to be Duffy