Imagine how awkward it would be for Itachi to transition from his stiff and respectable clan to the Akatsuki. The culture shock would be overwhelming.
Itachi going to the hideout’s kitchen for breakfast, fully dressed, hair up, weapons on him, ready for the day: ……
Hidan and Kisame, shirtless, eating peanut butter from the jar with spoons: ….Yo
OR
Itachi going to the living room at 2am because he needs to refill his water bottle
Deidara, eating an entire cake by himself: sup
ABSOLUTELY-
Also, Deidara and Itachi are pretty close in age, but so far apart in temperament. So I can see Deidara doing this kind of shit but Itachi being so done with it every time.
Deidara, explaining why they need to do insert reckless or idiotic thing: It’s normal! Normal teenagers do this!
Itachi: I HIGHLY DOUBT THAT