Taylor Swift is defending her brief relationship with Matty Healy -- which came under a microscope by overly-concerned fans ... whom she's kinda ripping into on her new album.
The singer appears to slam her fan base on "The Tortured Poets Department" on one particular song that touches on the backlash she experienced for dating Matty last year ... the track's called "But Daddy I Love Him," and it eviscerates everyone who chimed in.
Her lyrics go something like this .