Why does rice in the southern population only represent rice?

It is also a nine-year compulsory education, and the basic education in the south is much worse than that in the north, and big jokes are often told suddenly! I always feel that I am right, hehe! As far as the word rice is concerned, I have met many migrant workers in the south who just think that rice refers to rice! But rice is not only produced in the south, but also in the north! Although it is not a large-scale staple food in the north, it basically eats rice every other day! In some places in the northeast, rice is the staple food! Rice first refers to whole grains! Everything you eat can be called rice! Rice is just a general term for food! As far as Shaanxi is concerned, ask people politely, have you eaten, or have you eaten, and didn't go to eat together! If you think like a southerner, you really don't know how to ask people if they have eaten. How come? Did you eat the food? There are so many kinds of dishes, ask them one by one? Did you eat rice? Did you eat noodles? Did you eat meat? There are so many kinds of meat, ask them one by one? Play? Let people think you are laughing at him, can't afford it or something! Therefore, the basic education in the south really needs to be improved. Don't always make people feel that southerners are so ignorant!