1. Not declining gifts
via GIPHY
Americans are quick to accept gifts, favors, and invitations, and often without offering something in return. However, many cultures (like in Japan) expect you to decline things a few times before ultimately accepting them. In China, you’re even expected to refuse a gift three times before accepting it.
> In a lot of countries, especially in the Middle East, Latin America, Western Africa, Russia and Greece, a thumbs up basically has the same meaning as holding up a middle finger does for Americans.
In Russia, a thumbs up basically has the same meaning as it does in the US (as well as holding up a middle finger).