What he means is if you feed a rabbit a carrot, it will eat the green bit, and then look at you as if asking what this orange crap is. In short, in real life, rabbits don't really care for carrots, instead preferring other leafy green vegetables.
Ba, there are a lot of such myths. Doesn't change the fact the post is win. BTW, there are humans that think the carrot root is crap and make soup from green part.