What an interesting thread, lucidly and charmingly debated mostly by the citizens of original English.
May I opine? Mispronunciation, like misappropriation of words is appreciated more only if the user actually knows the correct version (in my humble opinion); most of the time we can tell if the user knows. Asinine expressions or phrases like, well you know, "you know" are obnoxious when used frequently as a "crutch".
Who cringes when we hear people repeat unnecessarily the word "addition"?: in “addition we add” an extra xxx; or, "the reason why"... do we say "the method how"?, etc .... "Different pronunciations vary" ....(are there differences that are the same?); one too many nuance for me!
Would it be funny if a comedian tells jokes about Americans to non-Americans, using the Southern "y'all"?.... when perhaps many in the audience do not know that y'all comes from "you all".
I would like to think that those of us who are multi-lingual and have some interest in the cultures that define these languages, take much more care to learn the correct pronunciation and meaning of words and their nuances. Example, the French word "la canicule" (little female dog, bitch)... is generally translated as "dog days of summer" but is that as precise as it should be? Or, “El Nino” (the child) means nothing unless you already know the meteorological reference.
Does that mean we should strive to become sequipedalians? My answer is yes... for it reflects an interest in understanding and explaining more fully meanings of words...more precision.
To dismiss mis-pronunciations or mis-understandings as being communication also, is proletarian and disdains the earnest search for great truth and meaning, and endorses superficiality.
After all, who can devise the best jokes about rocket science? someone who knows the main points of the science... of course it requires that audience also understand the references...
Years ago there was a certain " Professor Kory" making the rounds of US universities leaving students of philosophy rolling in the aisles with his specialized humour. This required a decent fundamental appreciation for the many philosophical schools throughout history on his part (he probably flunked philosophy classes, bur learned enough to fashion philo jokes)
US TV personality Steve Allen, during the 1970s produced a mini-series entitled "Meeting of Minds" where he would act as the interviewer of important figures from history such as: Eliz. Barrett Browning, Machiavelli, Aristotle, Dr Sun Yat-Sen; another brought together General Grant (US Civil War), Marie Antoinette, Thomas More, Marx... and each had to react to the other's statements in a meaningful way. The effort to put this together required a vast array of knowledge, in depth... probably from an array of scholars who helped fashion the dialogue... This program raised my appreciation for Steve Allen exponentially....
Life is the final riddle, we all give up on it eventually...