Thats the point though isnt it....Nick does challenge negative posts. Surely the best way to go about it would have been to contact Joe directly, if there was a doubt over Joe's purchase then he should have asked for proof instead of going out and basically calling him a lier.
Nick can be a decent guy when he wants to be but what he has to realise is that not everyone will rate his chemical range and he should take the negatives on the chin instead of jumping in feet first. Look through the forums, someone will say a negative about every chemical from every supplier but you dont see those other suppliers jumping in feet first and calling people liers.