I have a possible reason.
The kid was probably adopted by some non uchiha family and so itachi didnt see reason to solo him. He's most likely fodder enough not to awaken the sharingan and so not important enough for Kishi's pencil
This is probably before Itachi killed his clan.
But irdk it's probably some fanboy.
...or a kid who probably borrowed a shirt from one of the Uchiha's.