A few things that bother me:

Does it ever bother you when people consistently misspronounce, or misspell words? It drives me insane!
Here's a list of misspronunciations that rile me up:
supposebly instead of supposedly
alot instead of a lot
warsh instead of wash (my mom also says squarsh instead of squash).
definately (is really spelled definitely)

Feel free to add to my list!