The arguments that "knowing how to behave" in settings and
contexts is culturally-conditioned is a strong one. Consider
how most of us might respond if taken back in a time machine to
the turn of this century, into a saloon with a "free lunch."
Would we intuitively know (unless we grew up in Chicago and
were regulars at the "Berghof") that we expected to help
ourselves, contingent upon buying a drink? We are culturally
conditioned to paying directly for food in an eatery. Or
consider that bevavior with banknotes, expected at some ethnic
weddings, would probably start a donneybrook at a wedding of a
different ethnicity. How would an American of lower
middle-class in the 1930s have known how to behave at (say)
the Henley cup regatta? etc.