Hi,
I think that Brandioch is trying, in his rather direct way, to get to an important point - a point that you don't seem to see.
He's not arguing that reality doesn't exist, nor that all of life is a coin toss.
His coin toss example simply shows that how you arrive at the "truth" - the correct number - depends on the ground rules for the search. A simple bisection search won't find the answer if the ground rules are that random chance determines whether you answer "high" or "low" (because there are an infinite number of numbers in any finite interval). If we can't agree on the ground rules, the definitions of words, etc., then we can't reach consensus on what the "truth" is or even if it's a meaningful term in a particular discussion.
I think "truth" is intrinsically related to human filtering of reality. It's not the same as reality. I think it's arrived at from what people perceive to be logical, or at least reasonable, conclusions. But the thought process isn't boolean - there are shades of gray, as you said. How can you fit a grayscale object into a 0 or 1 box?
We all agree, I think, that the scientific method is our best tool for finding out the reality of the physical world. Brandioch isn't disputing that. What he's trying to bring out is that value judgements about the results of experiments color our findings and color what we see as the "truth".
This becomes startlingly clear if you consider how people with autism, perfect pitch, and other rather uncommon brains perceive the world. There are reports of people like Tesla who remembered sounds as colors, etc. What we perceive as reality is tremendously filtered by our brains. And that in turn affects what we view as "truth". As does our experiences, our education, etc.
This is an interesting topic. I hope you'll return to it and that both you and Brandioch can continue the debate with little of the jabbing which seems, unfortunately, to usually enter these discussions.
Cheers,
Scott.