Is the target a person? I'm pretty sure it was a person't public product. In this case, their public words, opinions and critiques. If your job is to produce works for public consumption and you can't stand a critique of your work, you should find another career.
To clarify my earlier point, there are few things as satisfying to read as a witty evisceration of an argument or stance. For a public persona, I don't see much problem with applying it to their wider body of work as long as you think the criticism applies well overall. My earlier statement was fairly ambiguous in this respect.
Ah, well I was commenting on the portion shown above. Taken in your expanded context, it's not something I would endorse. That said, I still stand by my (revised) point, regardless of whether it was brought about by a poor example, which is that a witty evisceration of an argument or point of view can be very satisfying.
To clarify my earlier point, there are few things as satisfying to read as a witty evisceration of an argument or stance. For a public persona, I don't see much problem with applying it to their wider body of work as long as you think the criticism applies well overall. My earlier statement was fairly ambiguous in this respect.