But that is not necessarily true because words can change in meaning over time. So when a society is first established they decide that stupid is wrong but retarded is the correct medical way to refer to a person with cognitive problems.

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Then 100 years later it is decided that retarded is an offensive term. People who have been labeled as retarded determine that the word is demeaning.

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Well it's already established that retarded is the correct response to a person with cognitive problems. So now the expectation is that an entire population immediately shift to a new definition because it has become offensive to a small number. I believe that is where the issue lies.

I believe the issue is more with how words change over time and in the digital age how that expectation is instantaneous.