I found this list of "Deeply Annoying Phrases" on WashingtonPost in which readers are encouraged to pitch in their two cents' worth. Some are funnier than others, here's a few example.
"pwnd" - not even a vowel, I think one of my Gen Y friend told me it meant you were tricked, or something to that effect
"just sayin'" - I don't see anything wrong with it, at least in IM. I suppose it will be slang to use in proper writing, but how many in this country can still write properly, especially among Gen Y?
"Throw under the bus" - a friend of mine uses it all the time. Although I think wouldn't proper grammar be "threw under the bus" or "thrown under the bus"?
"I just threw up in my mouth a little" - eww
"Think outside the box" - love the saying, not sure what's the guy's problem with it.
"I know, RIGHT?" (when someone emphatically agrees with you) - the funny thing was: I just learned to use this "phrase" for the first time the day before I read this list :)
"At the end of the day" - perfectly good saying to me.
"It is what it is" - again, I don't see a problem with it.
"Quite frankly" & "I've got to be honest with you" - I use those two ALL THE TIME. LOL
Some people really just post for the sake of posting. British folks saying "indeed" is really cultural. But hey, different strokes for the different folks. At least it wasn't ONE person who was annoyed at all of the above. If it is, I truly feel sorry for said individual...