In the end, it is the PIC who is responsible for the flight.
That is the PRIMARY thing on the Flightdeck.
As a result, when he/ she asks something, it HAS to be done this way, no discussion except in case flight safety is jeopardized as a result. Always BRIEFLY explain the reason for doing something different than the FO's idea.
Discuss and argue all you want on the ground not during an approach.
CRM does NOT mean no more authority gradient onboard, although some young " pilots" seem to think that way
