My new language pet peeve is the overuse of the word "disingenuous." I remember many years ago having to look it up when I encountered it somewhere and thinking what a good word it was. Now, suddenly it's everywhere, mostly used interchangeably with "insincere." I hope it doesn't end up one of those words that loses its particular shade of meaning because people use it indiscriminately -- it really is one of my favorite words.
I don't have any examples -- it's 7 a.m. and I'm getting ready for Biology class -- but I'll try to find a couple.