I was puzzled by the conflict between Captain America and Tony Stark during the first part of The Avengers. There were obviously values that differed between the two.
Looking at their background, Steve Rogers is from a working class neighborhood in Brooklyn and never went to college. Tony Stark is from Manhattan and has an extensive college and university education.
It seems to me that there are two areas of value differences. The first is where they grew up and those communities and the culture of those two different communities. The second is changes in society and culture between the 1930s and 1940s and the 2000s which could be characterized as conservative and progressive.
So is the basis of the conflict between the two one of Blue Collar versus Educated Elite?
A comment lead me to wonder about the background and values of Romanov and Barton when considering the actions of Stark and Banner, both educated elites, in the second Avengers film. Stark and Banner decide to create what becomes Ultron during the second film without involving the other Avengers team members in that decision.
It appears that Barton is from the mid-Western US and lives on a farm which implies more conservative and working man or Blue Collar values aligned with those of Steve Rogers.
During the film Captain America: Civil War Barton joins with Steve Rogers while Romanov appears to support Rogers but to remain neutral over the actual conflict over the Sokovia Accords. Banner also remains neutral in the conflict over the Accords by removing himself from the group at the end of the second Avengers film thereby not participating in it.
Here is a discussion about the relationship between Barton and Romanov: How/when did Clint Barton and Natasha Romanov become friends?