I am so glad I found this site! I thought I had a lot of pet peeves, I'm so glad to hear other people are super annoyed too!
That being said, here are few I can think of off the top of my head:
Loud Chewing, or chewing of squishy sounding things...disgusting!
People who don't use turn signals
People who use bad grammar on simple phrases... if I know the person well enough, I will correct them, just ask my friends! :)
People who don't proof read their posts on sites like this or other places where you post things, it only takes a second to figure out you typed "ir" when you meant to type "it"! (that goes for emails too)
Not closing drawers, doors, turning lights off, etc...finish what you started/return it the way you found it!
People who talk excessively loud...I'm a quiet person and when I have to work with someone or spend time with someone who speaks at above normal decibles, I just want to shoot myself! I have to distance myself from that person and it makes me just all the more quieter, as if the loud and quiet have to balance at all times. haha
People who try to argue with me about my beliefs. You have your beliefs and that's great, I may not agree with them, but I respect you for them. You don't have to always critisize me for not eating meat or trying to recycle or whatever else it is I do that you don't like.
Whoa...that's more than I planned to write, but it feels good to get that off my chest! Thanks for listening, if you made it this far! :P