Tolerance
is a good place to start.
The anthropologists who originally promoted what they called "cultural relativism"
back in the 1930s and 1940s felt strongly that
ethical codes were binding or "valid" only with a culture. They
felt that this implied that we
should be more tolerant of the values and ways of life practiced by
people in other cultures.
Melville Herskovits, for example, seemed at times to believe that cultural
relativism implied greater tolerance of and non-interference with
other cultures.
I am inclined to agree. If we accept the notion that there are
cases in which more than one contradictory moral judgment can be true
or "equally valid" then we no longer have a basis for
criticizing and condemning the values of others. Their values are as
true as ours within their framework of understanding. But if we have no
basis for criticizing their values, then we have no reason to be
intolerant or to interfere with their way of life.