Wasn't an overreaction.
Spoilers have been posted before, things have been ruined, and the matter-of-fact way it was stated made me think it was fact.
It's also kinda retarded to assume that sharingan is what was given to him via the mouth-stuffing.
I always assumed it would be some sort of trigger, like the one he implanted in sasuke for when he meets madara's eye.
You know, something that triggers itself if Sasuke ever uses mangekyo against Naruto, or something.