Pointing at someone with the forefinger is an accusatory motion considered rude or hostile. When you point, use the entire hand, palm open. Laughing or smiling among Chinese can be confusing and means different things according to the situation. When nervous or embarrassed, Chinese will smile or laugh nervously and cover their mouths with their hands. This can be in response to an inconvenient request, a sensitive issue that has been brought up, or a social faux pas committed by the smiler or another person near by.
Hissing is a sign of difficulty or uncomfortableness .
It is impolite to point one's feet at another person. Chinese sit upright in chairs with both feet on the floor. In Chinese homes, people remove their shoes at the entrance. Be sure to wear clean socks. Chinese are not a touchy people, and they rarely hug in public.