At Chinese dinner table, the host usually asks the guests to "help yourself" or even fetches food for the guests, which is regarded as a hospitable manner.
The one who sits closest to the teapot or wine bottle will pour them for others. Guests don’t need to pour tea or wine themselves. Because that means the host doesn't take good care of guests, which will make the host "lose face".
When someone fetches food or pours beverages for you, the appropriate reaction is to say thank you. If you are comfortable with the food, eat it, or leave it on your plate.