Phew... what an immense amount of interaction! There's some serious ego-bruising there. I understand an author's wish to protect their work from unfair critique, especially if they're passionate about the subject and feel they're improving peoples lives through it. Such reactions are unwarranted, and in this case too extreme, making 'Dylan' look bad. They say 'bad publicity is still publicity', but i think 'Dylan' can do without it.
Whatever your business, self damage can't be repaired and a bad reputation is hard to recover from. I'd be interested to see what 'Dylan's' publisher or agent thought of this whole affair.