Should traveling abroad follow local cultural customs or should tourist countries welcome cultural diversity?

China National Tourism Administration has compiled the Convention on Tourism Civilization, which mentions that tourism should follow local cultural customs. Generally speaking, it is suggested that the behavior in the process of traveling should abide by the most basic civilized manners, that is to say, abide by the established behaviors in public morality, no matter which country or place, such as flushing after defecation (don't laugh, some people really can't do it), not washing feet in the washbasin (what happened in Thailand was done by tourists from China) and so on. On this basis, pay attention to the conflict between customary etiquette and local etiquette, and do it according to local customs. For example, a place is used to holding things with the right hand, because the left hand is considered unclean, so this will be done according to local customs. As for the "cultural diversity" of tourist destination countries, it is not contradictory to observing local cultural customs. What you do in China will be considered immoral and cannot be classified as "diversity"-for example, spitting, which is the most criticized by tourists in China, should cultural diversity be tolerated?