The Null Device
Don't talk to me about people who are "nice"...
is the linguistic phenomenon by which negative words or phrases lose their negative associations over time and become innocuous or even positive. Recent examples are "bad" (meaning 'good') and the likes of "shut up!"/"get outta here!" (generally translated as "you don't say?"). The phenomenon, however, is an old one: a classic example is "nice", which, until the 13th century, meant "stupid".
If this is an ongoing process, one could extend it to the future; i.e., if you're writing a story set some decades from now, you could have some phrase currently found unambiguously offensive used in an innocuous way in the dialogue (i.e., in 2030, something like "go bugger yourself" will mean "really?". For extra points, make the phrase colourful and/or anatomically implausible.)
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