In South America, claiming you’re from America, rather than the United States, is seen as being politically incorrect, as it implies that only the US should be considered America, and that South America is unworthy of the title.
6. Being fashionably late
Americans often make appointments for “around x” or “x-ish.” Being a few minutes late, or as we even call it “fashionably” late, is standard to Americans, but unacceptable in many other countries (like Germany), where leaving people waiting is taken as you thinking your time more valuable than everyone else’s.
7. Being on time
On the other hand, many South and Latin American cultures, notably Argentina, would consider it bad form if you showed up to a dinner party right on time, akin to someone arriving an hour early in America.
8. Having one hand in your pocket
This is considered arrogant in Turkey, as well as some Asian countries, like South Korea.
9. Using your left hand for anything
Not all cultures have or use toilet paper, and tend to use their left hand in lieu of it. Accepting gifts, eating or doing pretty much anything with your left hand in much of Africa, India, Sri Lanka and the Middle East is like a (disgusting) slap in the face.
10. Opening a present immediately