Sadly, you'll never be able to convince me that the dialogue in Avengers 1 ever satisfies a goal other than making Joss Whedon feel smug for having written it.

Like someone brought up Fury Road, a movie so light on dialogue it didn't even have a script, but every line of dialogue in that movie does work. It tells you about relationships between characters, what they believe about the world and their emotional state.

Most of the dialogue in Avengers does nothing except "be quotable".