I read the whole transcript and I came to conclusion that the author is , to put it gently, bad faith.
Of course if you’re going to give negative opinion on the product made by a single man he is going to want to talk with you. The opposite would be strange, and denying its right to answer is disrespectful and childish.
Doesn’t mean you have to apologize or concede anything, but giving the man a quick and sincere talk about it is just basic level of dignity.