Why do some customers seem to get extra rude in busy situations, and how do you keep your cool when the line is long and tensions are high?

Is it culturally insensitive when K‑pop idols perform in extremely homogenous places like North Korea using styles (like dyed orange hair) that come from outside that culture, especially when the audience has almost no exposure to diversity?
How do you listen to a song that you have listened to many times, but experience it as if it’s the first time again?