Another reason might be due to a personal vendetta against someone in the village. If someone in the village wronged them deeply, like a powerful figure who abused their power, Naruto and Sakura might take actions that seem like betrayal to the village in order to seek justice. However, they would likely believe they are doing the right thing in the long run.
It could also be a matter of sacrifice. They might have discovered a threat that could only be stopped by them seeming to side with the enemy. In this case, they would be willing to sacrifice their reputation and be seen as traitors for the greater good, like protecting the entire ninja world from a much larger threat that no one else was aware of.
If Naruto's friends or loved ones are threatened by the ANBU, either directly or indirectly. For instance, if the ANBU's actions put Sakura or Kakashi in danger without just cause, Naruto would be likely to turn against them. He's very loyal to his friends, and any threat to them would be a strong motivation for him to take action against the ANBU.
One possible plot twist could be that Naruto and Sakura are forced to betray their village under some kind of mind - control. Maybe an enemy has a powerful jutsu that can manipulate their thoughts and actions. So, they end up doing things that seem like a betrayal to their friends and comrades.
One reason could be that Naruto is focused on his own goals like becoming Hokage and he might see Sakura's feelings or her actions as distractions. He has a lot on his plate and may not have the time or energy to deal with her in a warm way.
One possible reason could be that she might have underestimated Naruto in the past. She often belittled his abilities and dreams, but as she grew and realized his true strength and determination, she felt the need to apologize for her previous behavior.
If Naruto and Sakura betrayed, their closest friends like Sasuke would be deeply affected. Sasuke, who has a complex relationship with them, would be in a state of shock and confusion. He might initially try to find out the reasons behind their betrayal and could even be torn between loyalty to the village and loyalty to his friends.
Perhaps it's a training exercise that gets out of hand. In the world of Naruto, intense training often mimics real battles. If they were sparring and emotions ran high, it could turn into a full - fledged fight. Also, Sakura might be trying to prove herself to Naruto, and Naruto, not understanding her intentions, might respond aggressively.
One reason could be that Sakura is confused about her own feelings. Maybe she has feelings for someone else and doesn't know how to handle Naruto's obvious affection towards her, so she lashes out and ends up hurting him.
Perhaps they misunderstand Sakura's relationship with Naruto. They might think she has romantic feelings for him when Naruto's parents have other plans for their son, so they yell at her to keep her away.
Perhaps Sakura is in a state of extreme stress. Maybe she has a lot of pressure on her, like trying to save a village or a loved one, and Naruto's actions, which might seem reckless to her at the time, cause her to snap and hurt him without really meaning to.
One possible reason could be Sakura's constant pining for Sasuke. Naruto might feel frustrated that she's so focused on Sasuke when he's right there for her. In the Naruto universe, Naruto has always been a bit jealous of Sakura's love for Sasuke, and in fanfiction, this could be amplified to the point where he yells at her out of pent - up emotions.