Yeah this whole leech branding is a ridiculous overreaction. If we disregard all of the Tuttosport bullcrap, there have been two serious opportunites to sell him, both to Lazio. Last september Conte refused the transfer last minute, and in january Quagliarella did refuse it himself, but with credible sources reporting that he agreed to join them in the summer.
So there was exactly one time that we know of where Quagliarella indeed said no.