customs table manners quiet polite rude be supposed to count

　　In different customs,the table manners could be quite different.For example,in China,it would be regarded as polite to keep quiet when eating.However,things are rather different in Japan,something that we think is rude,however is popular there.It is said that we should make loud noise when having noodles.Because it is a way to show how you like the food.Whatever the customs are,we should always remember one rule:Do as the Romans do.We are supposed to learn some basic customs when we are going to a new country or place.

M: Do you know some table customs in your country?
W: Yes. In my country, people are supposed to be quiet and polite when eating. Any rude manners, like laughing and making noise are not allowed.

OK?

能增加几个单词吗？
A quiet table manners may supposed to be rude since different customs.

这个句子本身就很奇特……