Re-watching Joss Whedon’s movie will give you a stronger insight into exactly what’s going on in Spider-Man’s head whenever he puts on his costume.
The reverberations of the events in The Avengers are still being felt years later in the Marvel Cinematic Universe, and that very much extends to what we see in Spider-Man: Homecoming.
Plus, Spider-Man: Homecoming has narrative elements that tie directly back to the blockbuster, so it really just wouldn’t hurt to get a refresher course on the details.
The Battle of New York allowed the world to see real superheroes unite and prevent global annihilation, and one of the many that these characters wound up inspiring was Peter Parker.