I think one of the reasons captains and crew have dysfunctional problems on yachts is because it is an unpaid position without a clear discussion, definition and agreement of;
"Why You Are Here?"
With paid Crew its easy. It's all about performance.... You fail to perform and you are let go.
Nothing personal and simply business.
With volunteer crew, expectations and relationships can be fuzzy and when both parties disappoint one another, it is taken more personally.
The only time I have had horrible paid crew was on a commercial delivery
when the Owner, sent some of his young harbour captains of his towing fleet to crew for me with his purchase
of a large offshore
They thought this was a paid holiday from Acapulco to Vancouver
They were supposed to help me make the necessary repairs
before heading north.
Instead, Girls/booze/fights, which only slowed down when two of the three came down with a dose.
They were useless and a liability both ashore and at sea.