Of course not, but I also don't let them know I've gotten rid of it, which is what refusing does. It is rude. That functionality is intended to allow people to dissociate with people who've written them hurtful fic, people they've had a falling-out with, etc. It is not intended to enable childish petulance over not getting a fic precisely to your taste. And, again, we aren't even talking about refusing; we are talking about trash-talking your gift to a (presumed) third party!