^in the modern times, it is just exchanging ideas and music, but if you consider before Korea had their boom, they wouldn't be close to each other
I think personally it lies more with the people who need to stop the questionable stuff rather than the idols, the idols are more or less not accustomed to the outside world and making fun of another culture isn't cool, even though mark my words, I do that here a lot knowing everyone knows everyone, but once they know it will be released, they have to do a quick scan over, and it may not prevent all, but it can prevent some if not most posts