If the hurt is physical, Tony could retaliate in self - defense. He has his Iron Man suits, which he could use to protect himself while still trying to avoid causing too much harm to his former friends. At the same time, he would be deeply hurt emotionally and might start to question his relationships with the Avengers.
He could also go into a state of isolation. Tony might retreat to one of his many properties, cut off communication with the outside world, and start to work on some new technology or project as a way to cope with the betrayal and pain. He might be thinking about how to prove his innocence or how to make the Avengers see the truth.
In a fanfiction scenario, Tony Stark could be hurt emotionally. For example, if there's a rift in the Avengers team and some of his closest friends turn against him. This could lead to him isolating himself and getting into a downward spiral of self - doubt and pain, which is really interesting to explore in fanfiction.
He could also become more defiant. Instead of trying to win back their favor, he might double - down on his actions and beliefs. For instance, if they hate him for his use of a particular technology, he might continue to develop it just to prove them wrong.
Thor could be angry. He's a proud warrior and being kicked out like that might be seen as an insult. He might even challenge Tony in some way, either verbally or physically. However, he also has a sense of honor and might listen to Tony's reasons if given the chance.
Tony would probably be extremely hurt. He trusted his team, and betrayal would cut deep. He might initially be in denial, not wanting to believe that his friends could turn on him.
They might be in shock. Tony has a complex past, and seeing it all unfold could leave them speechless.
The Avengers may become more empathetic. Learning about Tony's family issues or his unspoken fears through fanfiction could make them understand his sometimes difficult behavior better. They might start to cut him some slack when he acts brashly, realizing there are underlying reasons for it.
The Avengers would be in a state of panic and fury. Captain America would likely lead the charge to find Tony. He'd use his military strategy skills to plan a rescue mission. Thor might use his godly powers to track down any signs of Tony's whereabouts. Black Widow and Hawkeye would be on the lookout for any Hydra agents or informants. Hulk could be a wildcard. He might be uncontrollably angry and ready to smash anything in his path to get to Tony.
They would react differently. Tony might be a bit embarrassed but also secretly pleased. The others, like Thor, would probably be very curious and want to read some of it.
Peter is likely to be in awe. He might be a bit nervous at first, but also extremely excited. He has looked up to the Avengers for a long time, so meeting them would be like a dream come true. He would probably be stuttering a bit as he tries to introduce himself and show his respect.
Peter might be initially shocked and a bit scared. After all, Tony is like a mentor to him. But then he could become defensive, trying to explain his actions or point of view.