Gon:
He didn't know that you own the (f/f)..
So when he took it from the fridge, he almost got a heart attack when you jumped out of no where and and swiped the food from him saying:
"MY FOOD" in a demonic voice.

And he never stole from you ever again...

Killua:
You and him just bought a ton of chocolates from a nearby store.
Killua already finished his and you still had so many... So he quietly took some pocky but you were too protective of your chocolates so when you saw him taking your pocky, he ended up getting a black eye.

Kurapika:
He's very observant, he already knows how you will react, so being the good guy he is, he politely ask if he could have some... And guess what?
You refused! Yeah, you're this obsessed with food that you don't even share some with ur bae.

Hisoka:
You don't eat food when ever he's around anymore. Last time you did, he got turned on and whenever he sees food, he'll molest it with his toung.... Poor food

Illumi:
You were too jumpy to even notice that your food is gone. So he just takes it without any effort

Chrollo:
You banned him from your library for a week. Yes. It's just food but it's YOUR FOOD! NO ONE TAKES YOUR FOOD!! NOT EVEN BAE!