Very good, compliments to the chef. It's not mandatory, and doesn't reflect bad or good on you. It's just something people occasionally do. It's always required, and expected, even if the food isn't to your liking. It doesn't mean anything, it's just an action. It's looked down upon, just like in America. Poor table manners. It's shocking behavior and gets you banned from restaurants. ▶ Next Question ◀