No, I'm saying they shouldn't be questioned because there is no true answer. So both people can be right, even if their cultural knowledge contradicts itself. (The only example that comes to mind right now is the arguments I had with cousins because my nickname for a school subject was something else than their nickname for it; slang obviously varies from area to area.)

May have phrased that unclearly/awkwardly/badly, I think I typed that with my first cup of coffee in the morning. :D

In the example of American editor versus somebody from the culture, the American might also be right but should probably be wary of calling the native's knowledge into question so strongly. So if I tell somebody who isn't Finnish what I called HomeEc and then my cousins tell that person their version, and that third party claims to know the real answers and denies the authority of my cousin's truth, that's rude and not cool.