Captain's authority under threat? This was not a disagreement among crew members in the middle of a critical situation. It was a dust-up over a bag for Pete's sake.
I am not defending the actions of the CSR, but talk about going over the top. Captains are supposed to be good leaders. Sometimes, leadership means knowing when to pick your battles and when to walk away. Sadly, all this story demonstrates is that there were two people involved, neither of whom knows that it's pointless to argue with an idiot.
