May I be permitted to add my most sincere agreement with the OP's sentiment expressed here?
Boy, does it annoy me ! (?) (Uncertain if that was a statement or a question). Not sure whether the use of the, now ubiquitous, upturned inflection annoys me more....in fact, yes, it does annoy me more, therefore to have the two irritations in one sentence is doubly intolerable.
Youngsters (although not just teenagers) are, of course, the guilty parties most of the time but it seems to be universal now and I see no hope for the human race.
It's just a matter of time before someone tells me to "get a life" and stop being concerned by such trivia. But I SO get annoyed at the use of "So" at the commencement of every sentence....... and the the use of the "So" word as I just used it there...I So dislike it!