40 years ago, it was normal to be "racist", normal to have preconceived ideas about people from "other cultures". I did my PPL in a Flying Club associated with a major school conducting CPL/ATPL training for the likes of Iraq/Libya/ Algeria & I remember only too well the comments of their instructors in the Bar shared by the Flying Club/ Commercial School.
What transpires now, is no surprise to anyone with even an iota of imagination/ bit of hindsight . . . sorry, but, your ability to do this aviation type stuff/CRM etc, is inextricably linked with where your culture originates (generally ) I.E. where is your country.
I flew (briefly ) for a Turkish Charter company, and the FO (Turkish ) A - preferred to let me kill him than speak up, & B - Just gave up if the landing got too difficult for him , because, well "Turkish Capts just take-over " (but, I never said I have control ) When you operate effectively "Single Crew" these little problems will happen.