Oh, my! I'm surprised that I didn't notice this thread earlier, because I am the *QUEEN* of pet peeves. So much so, in fact, that I authored a highly Google-ranked page on the subject (number one for many years and still within the top five without having updated it for over four years). In real life, I'm actually pretty easy going, though, considering how much everything pisses me off!
A huge pet peeve of mine is when a famous person wins something they say, "This has been such a humbling experience." Winning something is the opposite of humbling!! It actually justifies how great you think you are!! It is only humbling if you thought you were going to win but you lose. Then you can realize that you may not be as good as you thought. Therefore, you are humbled.
I also don't like the how the letters are arranged on a GPS system. They are actually in alphabetical order instead of the "QWERTY" format. It takes me forever to punch in an address.
When you tell someone that something isn't working properly, they say, "there's nothing wrong with it". It could be a tv that you tell your friend about, or a car that you take to the mechanic. What you have experienced is meaningless, and after one minute, they are the expert.
The word irregardless - people use it all the time regardless of what it means. Also, people who disguise criticism as a random observation. My neighbor said this morning, "I have found that such and such toxic chemical works the best for killing weeds". Yes, I have weeds, if it bothers you, just say so.
When cashiers won't make eye contact. They will look at the ceiling, the person behind you, your groceries, but not you. Also, when cashiers have one of those ear piece phones having a conversation while ringing you up.
Errr, I hate those home school "biology" textbooks that leave out biology and stuff in silly mythical stories that the kids end up believing and having to deal with these people who have no sense of reality.