Hang on a minute, for all those saying "the Captain's word is final", you are quite wrong with that.
It is unlawful to refuse a REASONABLE order by the Commander of an aircraft.
In this case, from the evidence supplied, the Captain decided that as his request for the Gendec was not immediately acted upon then this was an act of insubordination and hence a flight safety danger.
What utter tosh.
Ask yourself this, if an F/O had commanded a G/A on an unstable approach flown by the Capt, would they then be offloaded, as clearly they are also insubordinate ?