In the West the guest tries to respect the ways of the host. However, in China the guest is treated with great kindness and respect by the host and guests are encouraged to do what they like!
For example it is rude to smoke in a Westerner’s home without asking and it is usually not allowed if the hosts are non-smokers. In China it would be considered rude to refuse someone to smoke in your house or hotel room or train compartment. Fortunately there are regulations restricting smoking in some places like trains and some buses.