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No evidence has been provided to prove that there has been a definite change in the early 21st century, and that the supposed new meaning is ""non-standard."" Maybe I'm missing something, but are you claiming that right-wingers  especially in the United States  in the 20th century and earlier used the term ""left-wing"" to mean something positive, and only in the past few years starting using it as a pejorative term? Also, saying examples ""abound"" is uncited opinion, so I changed it to ""Examples include the following.""  "