Don't jump to conclusions, Mr Freestone. This is my 1,946th post on this forum and I have participated in numerous interesting discussions here.
Just because I refuse to discuss any further with you doesn't mean that I am not generally open to discussion. In fact, in the course of my 1,946 posts, you are only about the 2nd person here that I've ever decided not to further engage. Perhaps that reflects something more about you than me.
From this -
"ALG refuses to further discuss with Mr Freestone"
it takes quite a wild leap to get to;
"ALG now thinks that nothing is testable"
"ALG must be suffering from negative effects on his mental functioning".
But your wild leaps do assure me that I am making the right decision in deciding not to discuss further with you. I am already a bit slow here - Wax Frog, impaul99 and Dave marshall caught on a lot earlier, judging from their responses to you (or in Dave's case, his non-response to you).