Buddhist etiquette was passed down to us about two thousands years ago. These practices survive our present day modern society because they have helped us to develop respect for the teaching, our teachers and gradually, all beings. A respectful person is well-liked everywhere.
Furthermore, with practice, we can discipline our mind, speech, and actions, from which our integrity is judged. A person with integrity is a respectable person, and will always be trusted in his or her community.