Why do Taylor and Katy have beef? Please tell me it has nothing to do with some dude.
Here is what happened:
1) Katy finishes her tour for Teenage Dream, and begins working on her next album. Her dancers are out of work.
2) Her dancers join Taylor's tour, but don't sign any contract, and tell Taylor/her management that they are Katy's dancers and they will return to Katy the moment she asks them to do so.
3) The dancers join Taylor's tour and are touring with her for several months
4) Katy finishes her album, and needs her dancers again to rehearse for performances.
5) The dancers inform Taylor/her team of their leaving, and leave soon after
6) Taylor is PISSED and believes Katy stole her dancers in an attempt to sabotage her
Taylor then wrote Bad Song, a song bashing Katy, released it as a single, and then recruited a band of women to help her make the video for the song.
Katy then, naturally, calls Taylor out for talking against "pitting women against one another".