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Social etiquette is like clothing to a human being.  A person bears nothing is ridiculous, and, undeniably degenerates to moral corruption.  A society would collapse into chaos with no etiquette.  The necessary interactions among its members would be plagued with unnecessary conflicts and controversies.  Take the society as a train, the etiquette would be the tracks, upon which the train rumbles.  Take the society as a VIP carriage, the etiquette would be the wheels and axles, upon which the carriage rides.  Without etiquette, the best friends can descend to deadly foes; allies can turn against each other in war.  Such examples are abundant in the human history.  Therefore, if I may suggest, treat everyone with proper etiquette, and abide by it, so that one may never offend others or make enemies.