Flipping someone off is a gesture of disrespect in many cultures, and China is no exception. The most common way to flip someone off in China is to extend the middle finger while keeping the other fingers curled inward. This gesture is considered to be very offensive, and it is important to avoid using it in any situation.
There are a number of other gestures that are considered to be disrespectful in China. These include pointing at someone with the index finger, making a fist with the thumb extended, and sticking out the tongue. It is important to be aware of these gestures and to avoid using them in any situation.