Tropes are common denominators. Their viewers recognize them, laugh at them or groan at them, but most of us can guess where they're coming from -- specifically, what cultural values are embodied in the trope.
Unfortunately, some tropes just don't travel - or age - very well. They're fine on their home turf, where everyone understands them and knows what value system they're based on. When that trope makes the trip to another country however, it gets seasick on the way over, arriving at port looking distinctly disheveled and finding itself among strangers who have no idea what it's talking about.
Since there are so many countries and cultures in the world, it's not surprising that there are so many different outlooks on life -- what's important, who's important, what constitutes justice and what qualifies as cruelty changes according to where you are. Even in countries that speak the same language, values can be different. The UK and the USA, for example, share a language and are regarded as culturally similar to one another... but handguns are legal in the USA, while they are banned in the UK. The UK also has no death penalty, while many States in the USA do (though some have banned it; one of the more recent bannings being Illinois's). This leads to some fundamental differences in the way the legal system is perceived, even between two countries that are supposedly alike.
Sometimes, the difference is even closer to home. A show where the death penalty for a criminal is a good ending in a state that accepts such a measure may not be as accepted as such in a state that frowns on execution. With the multicultural nature of many places, sometimes a trope only has to go down the street to become completely unrecognizable. Differing religions, backgrounds or life experiences can mean that a person's view of a trope differs from the "standard" the trope is derived from.
Other tropes find it difficult to age gracefully. The world being the dynamic and evolving place that it is, some aspects of the media don't quite manage to keep pace with the time, and become the "Grumpy Old Men" of Tropeland.
See also Unfortunate Implications. Compare Moral Dissonance, where the show breaks its own morals. Also see Germans Love David Hasselhoff, in which it's critical acclaim rather than moral values that is on the line. Also see Fair for Its Day, in which the work actually has less values dissonance than its contemporaries. See Culture Clash and Innocent Bigot for when this happens in-story and Deliberate Values Dissonance for when the author is doing it on purpose. Also see Have a Gay Old Time and Get Thee to a Nunnery, where dialogue is interpreted differently due to this. Has similarity to Good Flaws, Bad Flaws. Contrast Blue and Orange Morality and Values Resonance. Can sometimes result in Misplaced Nationalism.
An example of Values Dissonance between the United Kingdom and the US would be the use of blackface imagery, which formed the centrepiece of the BBC's Black-and-White Minstrel Show until the 1970s. Blackface was/is also used in other countries, such as Japan, The Netherlands, and Australia, where it does not have the same cultural stigma.
WARNING: By its nature, this trope is highly controversial. You may well encounter a custom or belief on this page that you don't think is dissonant at all; you might even be inclined to vehemently defend it. Indeed, concepts of right or wrong or even of what is "proper" are rarely universal in the truest sense of the word. Across all the advanced civilizations of Earth's history, just about anything has been or can potentially be justified, or at least rationalized. So if you see an example here that you disagree with, please refrain from adding your own interpretation.
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