Other, older habits have been known to make some visitors a little uncomfortable when not used to fellow diners slurping their soup, laying discarded bones on the tablecloth, and audibly making a meal of a meal.
The second habit is dying out now that most restaurants provide side-plates for bones but it is still possible to see waiters clearing a table by sweeping everything into the middle of a tablecloth - rice bowls, chopsticks, bones and all - in order to have a vacant table as quickly as possible.
As for meal-time noises, they are considered sounds of culinary appreciation, the slurping of soup also being an acceptable way of cooling it down before it burns the tongue.
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Everyday Eating Customs in China