In the face of Trollboy's continued evasions, would anyone care to hazard a guess at why moral relativism might be "disproven"? So far as I can tell he starts with the odd notion that something must be absolute to be real, so - um - real morality must be objectively true then. Oddly though, he seems to think that, say, having an opinion on a piece of music being good or bad can be a real opinion without recourse to a supposed gold standard of musical worth.
So leaving aside his busted flush of an assertion, why might moral relativism be "disproven"? What I see is a world exactly as I'd expect it to look with people partially intuiting and partially reasoning their way to moral positions - probabilisitic, uncertain, messy, changeable as that might be - and living their lives accordingly. It's not so much that that's "proven" - it's just the way that it demonstrably is.