Why are there rules of etiquette in society?

The rules of etiquette have always been created so that people understand where they are and how to behave in a civilized society. Each person should not only follow all the rules, but also talk about it to others, because the culture of speech, manners and correct behavior at the table make a person think about how he should be in society and whether he behaves correctly. All the rules exist in order to comply with them, no one would be pleased to see a person next to him who swears in obscene words, behaves uncivilized and makes you want to stay away. That is why it is worth observing etiquette.