17 American Behaviors Considered Rude in Other Countries

4. Altering Your Meal
Both at restaurants and when dining in someone’s home, adding spices or condiments to your meal is seen as a slap in the face in places like France, Spain, Italy, and Japan.The cook sees this as the meal not being prepared well, and that’s pretty darn offensive. So, just to be safe, maybe don’t ask for that bottle of ketchup.