The problem for Ms. Swift is two-fold: she's a super-successful female in a world that is deeply ambivalent, at best, about female success, and also, she mines her life for her music, angering a lot of people in the process. If she happens to poke the wrong person, or dragon, they'll rain down fire upon her.
There's just something about successful women that we love to tear down, especially when they're revealed to not be as perfect as they present themselves to be. So, Taylor lied about discussing a few lyrics. Burn her to the ground. Chris Brown beat up Rihanna. Buy millions of his albums. Woody Allen allegedly molested his young daughter. Give him all the Oscars. The fact of the matter is, celebrities lie to protect themselves all the time. This isn't new. But when a successful woman lies? Oof. We better take her down a peg or two and try to ruin her career.