Not only is this not the first time Swift has had to defend copyright infringement allegations in respect of the song, but the specific lyrics in dispute have actually been defended before. In 2015, California songwriter Jessie Braham attempted to sue Swift for alleged copyright infringement of his 2013 single ‘Haters Gone Hate’ seeking royalties of $42m. The case – “shaken off”.
Read more here http://www.bbc.co.uk/news/entertainment-arts-43056814