One big difference between the two cultures, is the British caste system.
It's important for us to Know Our Place. Me mum[0] was British, and I used to see this attitude, all the time.
Climbing is OK, but you need to do it properly. Americans are told "Don't take that shit! Force them to accept you!", while British are told "Tsk. Tsk. You can't do it that way! You need to join their club, before you try going to their level."
Heroes are often those that accept their lot.
And of course you get just as much snobbery from your own class about wanting to climb.
It is possible for a working class person to become Middle class. But you have to be born to the Upper Classes. You can get some way by sending your Children to public school (The perverse name for the most exclusive private schools!). The kids might make it, but you will always be 'new money'.
Caste system, as in https://www.youtube.com/watch?v=9XmB59Ax4cE ?
Along the lines of https://www.orwellfoundation.com/the-orwell-foundation/orwel... , I'd maintain the US national fiction is "the US is a classless society".
lagniappe: https://www.youtube.com/watch?v=XPPpjU1UeAo vs https://www.youtube.com/watch?v=-TQmo5TvZQY vs https://www.youtube.com/watch?v=__HPfmvaWRw