It's like saying in India, Indian Food is just food. This means that the only reason why we specify a certain type of food is because it is ethnic. In China all food is Chinese unless otherwise noted, so there is no need to call Chinese food in China "chinese food" that is just being redundant. It's like if we, here in the USA, called all the food we ate american food. To us it is simply food, the only time you need to specify is when you are not in the country of the food's origin.
Hope that's not too confusing.
- For Teachers