Regarding tptacek, I suspect that if he had sent this to the author, or posted it as a formal review, I suspect he would have toned down the description of his reactions. I'm not sure where this review came from, but my impression is that he did not think of it as a published review that the author would see. Certainly doing such would be advisable, as people are more receptive to criticism that way.
Perhaps I am wrong regarding how tptacek would have responded had he known the review would be, essentially, published. But I know I phrase things differently in such situations.
A better way of apologizing is actually apologizing. The young man's reaction was more like exasperation that I should have been put out.
My impression is that the comment was/is a comment on social media. My comment was written in that context.