He never thought someone would do this to him.
Because it uncovered a weakness, and weakness is not to be tolerated.
It didn't matter if there was still strength, because letting weakness exist, letting it thrive, was shameful.
And on second thought, Itachi thought in an irritated manner as he flailed blindly around, trying to dislodge the weight that remained stubbornly on his black and over his face, it had probably been a bad idea to agree to playing peek-a-boo with Naruto during his spare time.