There are numerous customs and practices that Americans use mostly without having a second taught. However, they most times take this act and customs to other countries and are seen as being offensive.
However, here at viralgossiptalk.info we bring to you compilations of 24 common American customs that are Seen as offensive in other countries, starting with
24. 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.
In most Asian countries, most notably China and India, tearing into a gift in front of the gift giver is poor form. It looks greedy.