The Avengers' reactions would vary greatly. Clint Barton might just chuckle and say it's a fun read. Wanda Maximoff could be intrigued by the emotional depth or the alternate universes presented in the Spidermen fanfic. Vision, on the other hand, would try to objectively evaluate the logic and consistency within the fanfic. He might point out any plot holes or praise the well - thought - out parts of it.
Tony Stark, being a tech - savvy and somewhat sarcastic person, would likely have a humorous take on it. He might make witty remarks about the fanfic's plot or the Spidermen's abilities. Steve Rogers, with his more traditional values, might be more critical of any deviation from the 'classic' Spiderman image. Thor, being a god from another realm, might see it as a strange but interesting human creation.
It gives fans a chance to explore different 'what - if' scenarios. By seeing the Avengers' reactions, fans can get a deeper understanding of the characters.
He might also get angry. Peter has a strong sense of justice. If he feels that the Avengers are being unfair, he could stand up to them. He'll use his quick wit and his powers to show that he's not going to be pushed around easily.
Some of them would be amused. Hawkeye might chuckle at the outlandish scenarios in the fanfic. Black Widow would be more reserved but still interested. She'd be quietly observing and thinking about the implications of the story. Captain America would try to find the moral of the story, if there is one, as he always does.
One interesting idea could be the Avengers' reactions to seeing alternate versions of themselves. It adds a new layer of self - discovery and character exploration. For example, they might see a version where they made different choices and learn from it.
Some of them could be in denial at first. They might think it was some sort of trick or false vision. But as they watched more and more of Infinity War, they'd have to accept the reality. Then, they'd start to think about how to use this knowledge. Maybe they'd try to find a way to go back in time like Dr. Strange did in the real movie, or find a weakness in Thanos that they didn't notice before.