People didn't get this?
I can understand some folks not liking it because it has cutish characters, or didn't like the music, but 'no plot'? This was about individual couples vs discrimination (i.e. interratial dating. picture them all human, the bunnies as black, the cats as white and it'll make more sense; you can insert your own racial pairing if you like though). Sometimes the message whispers instead of screams; art is evil like that.
On a lighter note it was well animated and very smooth, the song fit the mood and timing, and was a cute way of handling a deeper issue (or just plain cute). I'm all for it.
..and so another song I don't know the words to gets stuck in my head.