When I lived in Elmhurst, there was an old Chinese woman who made the most disgusting sound, followed by a huge spit on the sidewalk, even in front of me while walking by.
I wondered what that was about... an insult or what?
One day she did that in the building lobby so I stopped and told her: Excuse me but in America that is disgusting and someone could easily slip on that (on the smooth stone lobby floor) and fall.
She obviously didn’t speak English and had no reply so I told her: Ching-chung-chi-chun-cho-ching, while pointing at her spit.
She then off loaded on me with a long Chinese reply. LoL!
I told her thank you.