North Americans who have lived in Korea for any length of time share Michael Aronson's frustration. Many Koreans presume that because our skin is white (or black), our tongues are too delicate to handle many of the bold and spicy dishes they love.
It may have something to do with the fact that many South Koreans don't know how multicultural our taste buds are. Many North Americans, particularly on the coasts and in states that border Mexico, have been exposed to various spicy cuisines in the form of Tex-Mex, Thai and Indian cuisine long before hopping on that plane to Seoul for a year or more of work in Korea.
There could be an inferiority complex at play in the assumption. Unfortunately, some Koreans assume Western foods are inherently superior. That's very unfortunate, because Koreans have plenty of culinary lessons to teach North Americans that can make us healthier and thinner.
Or as Aronson said in the video, "As a foreigner, I often get asked by some Koreans if I eat/like Korean food. Why wouldn't I?"
The video below a short skit of Michael Aronson and Matt Lee's reenacting misunderstandings weygookin (non-Koreans) and hangookin (Koreans) experience when deciding which food court hawker stand is good enough for the both of them.