Itachi had no way of knowing -- or did he, perhaps, seeing what was missing from Sasuke -- just how poorly those words struck.

"Your eyes?" It was a venomous hiss -- and in anger, Sasuke did indeed take a few steps into the room, but it was with a crackling fury, his chakra flickering through the room more heavily, a tingle like static in the air. "Your eyes? I thought you'd already resolved that little difficulty!"

He'd been told about the differences, but in that moment, confronting Itachi with such a poorly-chosen remark on his lips, he couldn't remember the truth of it -- all that mattered was that this was Itachi, and Itachi had stolen Sasuke's eyes to replace his own. It was all he could know, a haze of tingling anger filling his mind.