I think the real point of CRM is the realisation that no single person is a flawless expert on anything.
We all make mistakes. We all miss things.
What used to happen was that pilots were seen as doing a very complicated and difficult job, and only senior captains thought they were any good at it. Everybody else, the co-pilot, the cabin crew, the ramp agents, the operations staff etc were all lesser beings in the eyes of these crusty old Atlantic Barons, as they became known. ABs could be the king of the castle on the flight deck, and some of them took this to heart, loving being able to boss people around and shout at them.
However, accidents such as the Staines crash happened and much later, the crash at Tenerife North, and it was realised that a much better way of operating was to listen to ones crew, operations staff and ramp staff who might have spotted something important that the AB had missed.
So CRM should be about open discussions, accepting questions about your decisions with good grace, and listening to your whole crew.
What is described in the OP is nitpicking, not CRM and it should be avoided. If a serious deviation from safe flight is observed, then fine, but don't be a back seat driver, that is counterproductive.
Last edited by Uplinker; 28th Jun 2017 at 08:36.