OK, I was somewhat wrong. It is not entirely about self reflection (i.e., him singing to the side of himself that he hates). He's actually singing about a person he hates. However, he realizes that there's a little of that person in him.
From a live show - (J's intro to the song) "This is a little reminder that no matter how badly you hate somebody there's always something in you that's a little like them."
OK, I was somewhat wrong. It is not entirely about self reflection (i.e., him singing to the side of himself that he hates). He's actually singing about a person he hates. However, he realizes that there's a little of that person in him.
From a live show - (J's intro to the song) "This is a little reminder that no matter how badly you hate somebody there's always something in you that's a little like them."