It could also be related to his ninja training. He is always on guard and being touched might disrupt his focus or make him feel vulnerable in a dangerous ninja world. He has to be constantly aware of his surroundings, and unexpected touch could be seen as a threat to his safety.
Perhaps it has something to do with his jinchuriki status. The Nine - Tailed Fox within him is a powerful and dangerous force. He might unconsciously fear that being touched could somehow trigger the fox's power or make him lose control, and thus he doesn't like to be touched.
Maybe it's related to his sense of independence. Naruto is used to relying on himself and having others touch him might make him feel like his personal space and autonomy are being invaded. He's always been on a journey to prove himself, and being touched could be seen as a form of interference in that self - discovery process.
One possible reason could be that in the fanfiction, his family might have been portrayed as overly strict or controlling. Maybe they forced him into a certain path he didn't want to take, like a particular ninja training regime that Naruto found too rigid.
Another reason could be that Ron's academic performance is not as good as Hermione's. Hermione is very studious and intelligent, and her dad might expect her to be with someone who is also academically inclined. Ron, on the other hand, is not as enthusiastic about studying.
One possible reason could be that he has seen the darker side of the ninja world. Maybe he witnessed too much death and destruction during his missions and decided he no longer wanted to be part of it. Another reason might be that he has other dreams that he realizes are more important to him than being a ninja. For example, he could have a passion for art or music that he wants to pursue instead.
One possible reason could be his past traumas. Naruto grew up alone and was often shunned by the villagers. Physical touch might remind him of the times when he was pushed away or bullied, so he has developed an aversion to it in fanfiction.
Maybe Tony is a very independent person. He likes to do things on his own and get things by himself. Being handed things might make him feel like he's being treated as incapable or like a child.
Maybe they don't like fanfiction in general. It could be that they prefer the official, canon Naruto story. Fanfiction can vary greatly in quality, and they might have had bad experiences with some poorly written Naruto fanfictions in the past, which made them dislike the whole concept of Naruto fanfiction.
One possible reason could be a different upbringing in the fanfiction's alternate universe. Maybe he was raised in isolation or by people who influenced him to suppress family feelings. For example, if he was raised by a group that emphasized self - reliance above all else, he might grow up thinking family bonds are a weakness.
It could also be due to some sort of mind - control or curse. In the Naruto universe, there are many powerful jutsus and dark magics. Perhaps an enemy has cast a spell on him that makes him not care about his own life. This would be a dangerous situation as he could be easily manipulated into dangerous situations without self - preservation.
One possible reason could be some kind of dark magic or curse that has been placed on him. Maybe an enemy wants to weaken him by taking away his emotions so he can't fight with his usual passion.