Earlier quoted context omitted.
What you did was against the rules regardless of who you're talking about. It's not a borderline call. Maybe you don't owe disagreeable elderly journalists better, but you owe this community better if you're participating in it. https://news.ycombinator.com/newsguidelines.html
Is there a respectful way of suggesting a journalist is too senile to be reliable?
It's even worse than that, because really the whole ballgame on a thread like this is dodging what this blogger actually wrote, and instead pivoting to a credibility duel --- Hersh broke Abu Ghraib, and this guy... wrote a blog post? You've lost from the moment you accept that framing. Just read the post and consider what it says! The blogger did the work for you!
On the off chance that getting this feedback from someone on "the same side" as your argument is helpful, that is.