Is it all relative?

Abstract

According to relativists, people who speak simply of what's ‘true’ are naïve. ‘Whose truth?’ asks the relativist. ‘No claim is ever true, period. What's true is always true for someone. It's true relative to a particular person or culture. There's no such thing as the absolute truth on any issue.’

This sort of relativism is certainly popular. For example, many claim that we are wrong to condemn cultures with moral codes different from our own: their moralities are no less valid. Similarly, some claim that while astrology and Feng Shui might be ‘false’ from a Western, scientific viewpoint, they are ‘true’ when viewed from alternative, New Age points of view. What's ‘true’ and what's ‘false’ ultimately depend on where one is standing.

Is this sort of relativism about truth tenable?