Crew interaction between two experienced pilots will exist on a different level to that of a senior Captain/junior First Officer combination.To insist upon a singular and rigid format of CRM and apply that format to each and every flightdeck,regardless of crew make-up,would be unrealistic.
Politeness and mutual respect are common to differing formats(or levels) of CRM.However,other factors such as advocacy and assertion on the part of the co-pilot and the receptivity of the Captain to that advocacy and assertion will by necessity differ.The right to advocate and assert will still exist but will manifest itself differently.
The problems arise when the CRM format and crew combination are mis-matched.A Captain not listening to the counsel of a First Officer,whose levels of airmanship and cognitive judgement are above and beyond his rank,can be lethal.A First Officer who uses the egalitarian spirit of CRM to his advantage,who demands the privileges that it affords without the pre-requisite levels of airmanship and cognitive judgement,is rarely lethal but no less distressing.
If you've a modicum of social adeptness,education and upbringing,you're unlikely to ever need a CRM course in your life.