Well, most Korean people I have met here are extremely nice to me when I ask about a certain word or phrase. They even go beyond their efforts and try to speak the best English they can. I guess for rude native speakers, you really cannot do anything about them. You just have to find another native speaker that is nicer and more willing to work with you. I don't really generalise as I know that there are different kinds of people in a country or place. One may be mean, but there will be plenty more who are nicer. Just try to look around more and you will find a better person to communicate with regarding a foreign language.