"Bridge enjoys immense popularity partly because of the high standards of ethics and etiquette which are observed by the players who are expected to conduct themselves in a highly civilised manner.
Violations of proper etiquette are quite common from inexperienced players, either through ignorance or inadvertence. A well-mannered opponent who is the victim of a violation by such a novice player will, if comment is considered necessary, be at pains to make it clear that the comment is intended to be helpful and will never make a newcomer feel ill-at-ease. Bridge is an extremely ethical game..."
Read the full article on the ABF website.