I admit to being somewhat of a grammar, spelling and punctuation elitist. The thing with the misuse of apostrophes and not knowing possession from plural is maddening. And it seems that 3 out of 4 newscasters don't know when to use "farther" and when to use "further". Newscasters!
When I hear someone say something like "Yeah, I seen it" I immediately feel myself cringe and recoil.
Another one - perhaps my biggest - pet peeve is people who cannot seem to use a first person pronoun. For instance, a fireman who rescued a baby from drowning in river rapids will be asked, "What was it like?" and he will respond by saying , "You just act on instinct, you don't think." Who the F*#% is he talking about? Me? (I would do no such thing because I can't swim and I'd be too busy crapping my pants.) What can't he just say, "I". What is with that? It's everywhere!!!