It doesn't matter what the song or its remix is actually about, it is well reported in the media that it is about Katy so in the eyes of everyone who isn't a Taylor Swift fan the song remains about Katy. You can argue for the rest of time that it isn't meant to be about Katy, that doesn't change the fact a large part of its initial publicity came from the media talking about it being about Katy.
Taylor could've easily stopped all that with a simple "The media always tries to put women against each other - ONLY the album track is me attacking a woman, the single is me attacking men again for the 50th time, duh.
" or a "I lied in my original interview for attention, the song has never been about a female" - pretty sure that never happened?
The video is clearly about a female friend turning on Taylor and Taylor going out for revenge though. Unless it was a coming out video and I missed all the discussion on it?
Regardless of whether it's about Katy or not (it pretty clearly is at this point) Taylor allowed the media to create all that speculation about the feud and allowed her fanbase to all turn on Katy. She knew that would happen and that was pretty clearly her intention right from the start 
