I think the main indication of political correctness gone overboard is the constant changing of certain terms or words to describe things in a constant battle to be 'politically correct.' After working with children with disabilities for a few years, the terms used to refer to the students constantly changed in order to be politically correct and inoffensive.
The same goes with many other aspects of society, including the correct terms to use to name a certain race, or job, or medical condition, everything. I think it's just crazy. I'll say a particular word or phrase and I'll get the, "Oh, that phrase isn't used anymore because it's not politically correct, now we say ______."
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