[X] You're going to make Iruka-sensei make him give you your fan back.
Either this, or beating him up.
Yes, Naruto's in a bad headspace, an orphan doing whatever he can to get attention. No, this shouldn't be encouraged. He grows up to be a mature, reliable man capable of shouldering the responsibilities of the village and making decisions that can move the world - but right now, he's just a little shit who doesn't care how he makes others feel so he can get acknowledged by them, even if negatively. This really needs to stop.
EDIT: Oh hey, a better option presented itself:
[X] Explain to Naruto that he stole a prized possession given to you by your mom and you would appreciate having it back. If he doesn't give it back, then you can go ahead and beat him until he gives you your fan back. Diplomacy should be attempted first before moving on to other forms of aggressive negotiations.