this song is candied self-doubt, a litany of the things they say to keep you down. "don't you know people write songs about girls like you" is not an empty threat, but a too-full one; no matter what kind of girl you are, people will write songs about girls like you.
(also oddly reminiscent of the simple minds cover of "bring on the dancing horses", which had a similarly hypnotic effect on me when i first heard it...)