Shake It Off by Taylor Swift. 'Nuff said.
Seriously, this song of hers was a joke, with such intolerable sounds and her voice being so annoying, especially that little rap-like solo she does near the end. Doesn't help that it was overplayed to death, so I often found myself tuning out when it came on and it literally got old for me really fast.
I have always been someone who has been viewing a lot of pop hits this decade as a disgrace, but yeah as if I thought Taylor crossing into pop territory was going to ruin her for me, it surely did and in a very awful manner in my books.