People start using the "new" words as a derogatory slur. For example, to belittle people, you don't call them retarded. You call them mentally challenged. Now

People start using the "new" words as a derogatory slur. For example, to belittle people, you don't call them retarded. You call them mentally challenged. Now being "mentally challenged" has the same politically incorrectness about it as being retarded.