Note that many recording artists do not actually make that choice; it happens further up the chain. Regardless, whether or not a singer or producer uses a particular effect on their voice does not distinguish between the vocals being 'real' or not. If you simply don't like the way it sounds, on the level of artistic taste, well, you can make that judgement for yourself, but, to claim it's more profound than that is just pure pretense.
Also, why are we talking about autotuned vocals on a thread about a speech synthesizer? Claims of 'real vocals' are already out the window at that point.