Pleeeeese!
Let's get away from phrasing these issues in terms of different
cultures. I really don't think the fact that different people with
different views live in different cultures matters.
The people could live in the same culture and have different views.
Maybe they live in different subcultures like Italian Americans in New
York City and Norwegian Americans in Minnesota. Or maybe we just have
two individuals with different moral principles.
Aren't the questions about relativism the same in all these cases?