Dave Portnoy certainly has a new favorite song -- the Barstool Sports founder went bonkers over Taylor Swift's apparent Kim Kardashian diss track, "thanK you aIMee" ... calling it nothing short of a "masterpiece."
Swift's latest project, "The Tortured Poets Department," dropped on Friday ... and there's one song in particular that has everyone talking due to lyrics that seemingly shade the hell outta Kardashian.
Portnoy -- a diehard Swiftie -- gave a passionate review of the tune on X ... saying it validates his longtime stance in Swift's infamous feud with Kim K.