Saints fired Dennis Allen

I watched part of a podcast today where the host said that last week, before the Panthers game, Gayle asked some players if the locker room was lost and the response was that it had BEEN lost.

Can someone tell me EXACTLY what happened for DA to lose the locker room? Like was there a particular moment, game, event, practice, flight, etc... where the players are like, man screw this guy?
Some are pointing to Allen's apology for the late score against Atlanta last year that got the ball rolling. Personally I believe that it had to be some time before that, or else the players would not have taken it upon themselves to violate that unwritten rule. It appears the team had already separated themselves from DA by then.