Imho it's not good to deride anyone's ability if you haven't met them...or practised with them. What we can sometimes see in videos etc is not what can be felt..they don't always go together.
Further why would anyone want to create a situation of tension, whereby if you did meet you wouldn't do so without some goodwill?
The problem lies with when people push there own beliefs/knowledge into the faces of others without due care...
Quietly quietly is the way ^^
Some of us have been discussing this over the internet for 15 years and more. If nobody talked about their beliefs/knowledge it would have been a much shorter and less fruitful conversation.
I, for one, am more than happy that Dan spent years shoving this stuff in my face.