It is rude to disturb the people around you.
John is at the school library trying to study for finals surrounded by other students.
John wants to ask a fellow student who's not present a question about study materials.
John steps outside the library to make his phone call to the other student.
John calls his fellow student from the library and has a long animated discussion with him.
Other students in the library appreciate John being so considerate.
Other students are aggravated with John because he's disturbing their studies.