[Epistemologist]

I don't think there is anything per se that a culture will not accept because there is no absolute wrong in the broader frame of reference. However, I think that if a culture espouses mass suicide i.e. all its members kill themselves, then the culture wouldn't last. Then again, that doesn't necessarily apply to cannibalism because in cannibalism only a few die for the sake of others.

So, absolute rights/wrongs only occur within a culture's intersubjective frame of reference. If we look to the broader frame of reference, though, that right/wrong is just relativistic.