Pragmatics is a rather new area of knowledge and practice that is pretty important.
What a person says can be rude for another person of another language.
An example of pragmatics. A marriage of a German guy and a Japanese woman. They’re in their car going to somewhere. And the lady, instead of saying “We should stop and buy some sandwiches”, she says “Could we feel hungry sometime, darling, you think?”.
That is pragmatics.
Another example: a French lady says “It’s very cold here”, instead of “Do you all mind me closing the window?” / Photo from: newsimage idw-online de