I was thinking about prejudice as well here, however this is not a racial culture thing but a corporate culture thing. If an airline improves training and quality assurance pro forma due to a formal threat of being shut down, something is very, very broken. I'm not sure if I'd ever board a KE or OZ airplane again. If the accusations here are true, both should be shut down immediately.
The fact that the instructor may perhaps (or perhaps not) be mistakenly attributing to Korean ethnic-culture certain worrying aspects is completely unimportant. The real cultural problem is that an instructor perceives pressure to pass students he believes should fail. That simple perception, regardless of underlying cause, is a problem that sabotages efforts to improve.
