Naruto could also get really sad and start to doubt himself. He might think that he did something terribly wrong, even if he didn't. And he may try to change himself to win back their friendship, like suppressing his usual exuberant personality.
At first, Naruto might be really confused. He's used to thinking of his friends as his support system, so when they turn on him, he doesn't understand why. He'll probably try to talk to them, to ask what he did wrong. If they don't listen, he could become really sad and withdrawn. Maybe he'll start training even harder, using the pain of being rejected by his friends as motivation to become stronger.
Naruto might initially be confused. He has always looked up to Sarutobi as a respected elder, so being hated by him would be unexpected. He would probably try to find out why Sarutobi hates him. For example, he might go to Sarutobi and ask directly, hoping for an explanation.
Naruto might initially be very confused. He has always considered Team 7 as his friends, so the sudden hatred would be hard to understand. He could try to talk to them to find out what's wrong, but they might just ignore him or be hostile.
He could try to fight back against this hatred. Naruto has a strong will. Instead of just accepting being hated, he might try to prove everyone wrong. He could start by doing good deeds secretly or try to expose any false rumors that are causing people to hate him.
Sonic usually feels a great deal of shock and confusion at first. He can't believe that his friends would turn on him. Then he might feel anger, especially if he discovers that they were misled or acting out of unjust reasons.
He might initially be in shock and disbelief. Naruto has always valued his friends highly, so it would be a huge blow to him. He could try to reason with them at first, asking them why they are doing this.
Sometimes, Naruto will try to understand his friends' motives. He's a very empathetic person deep down. So instead of just getting angry and staying that way, he'll try to figure out why his friends did what they did. He might even forgive them relatively quickly if he realizes they had good intentions, even if their actions still hurt him.
Naruto might also be determined to change his brother's mind. He would keep showing his good side, like his kindness and his strong will to protect the village. He could think that by being a better person, his brother will eventually stop hating him. He may even go through some tough training to prove himself not only to his brother but also to the whole village. And in the process, he may face a lot of difficulties and rejections from his brother, but he won't give up easily.
His friends would likely be in shock. Sasuke, for example, might initially be angry at himself for not being able to prevent this. He would then start planning ways to break the seal and get Naruto back. Sakura would be heartbroken. She might use her medical skills and knowledge of chakra to try to find a way to communicate with Naruto or at least sense his condition in the moon. Shikamaru, being the strategist, would start gathering information about the seal and who or what caused it.
He might initially try to prove his innocence. He'll gather evidence or find people who can vouch for him. But as the situation worsens, he could become angry and more determined to find out the truth and expose those who are behind his false accusation. He might even leave Konoha to seek answers and allies elsewhere.