There are long lists and a few books of things to avoid doing when around people of various nationalities or ethnicities: never show the bottom of your shoe/foot towards an Arab (it’s extremely disrespectful), do not excuse yourself to go to the restroom during a meeting in France, don’t motion with the index finger in some countries (indicative of a penis symbol), do not blow your nose into a handkerchief in Japan (it’s considered nasty- use disposable tissues), do not open a gift in front of the giver in some countries, etc… What are the turnabouts: what are things other cultures would not consider rude but (North) Americans would?
I can only think of a couple off-hand:
Personal space issues: Europeans and South Americans touch in casual conversation a lot more than we do (with the exception of the British)
Mouth-to-plate-distance: Laotian and Vietnamese co-workers, even when using forks, tend to keep their mouths very close to their plates and eat fast, something you just don’t tend to do in an American dinner. (A Laotian friend tells me that many topics of conversation in southeast Asian countries would be considered rude in America for their bluntness; for example, she says it’s no more rude in her culture to ask a relative stranger “How much money do you make in a year?” or “How much did you pay for those pants?” than “what do you do?” or “how many kids do you have?”, but as I’ve only heard this from her and she also assured me that there are people in the jungles of Laos who are part dog, I’m not sure of its veracity.)