A boat and her owner shall compete in compliance with recognized principles of sportsmanship and fair play. A boat may be penalized under this rule only if it is clearly established that these principles have been violated. A disqualification under this rule shall not be excluded from the boat’s series score.
It is this rule that is most often cited as the reason for a host's house rule, such as:
kicking penalty hunters
kicking a skipper who does not answer a penalty cancel request