Having worked in Korea for 5 years, I can verify that the Korean culture has direct safety impacts on the flight. Whether you like or dislike the culture is a matter of personal opinion, but it definitely does not belong on a flight deck.
Some of the FO's and Captains I flew with were really nice, but the entire experience I had was one that made me really dislike going to work. The Korean work environment is one of hostility, stress and they constantly worry about everything.