Before I get to the main question, I would like to challenge some of the premises you've laid down. To whit:
Within two minutes the same highly-respected user adds a one-line comment the usually dismisses the question as nonsensical or is otherwise derisive. Every. Single. Time.
This description made me curious, so I decided to go and check out some of your recent questions on SO. And sure enough, on some of them there was at least one comment by a particular "highly-respected user".
While I recognize that some of the conversations may be deleted, from the few I've witnessed, your description of your interaction seems to be rather hyperbolic. The user in question doesn't seem to spout nonsense very often, nor does the tone of the discussion seem personally derisive or mocking.
Also, "Every. Single. Time." seems to be... maybe 3 times over the last 8 questions you've asked. Hardly the sort of thing that should keep you from asking questions.
Other times he adds a one- or two line answer that amounts to 'that's just how it works'. The question is essentially dead because no-one else wants to contribute after the wise one has spoken.
That's not how Stack Exchange works. If someone has an answer besides "that's just how it works," they're not going to not post it just because someone with high rep posted an answer. Indeed, someone posting a wrong answer is likely to attract a downvote and/or a comment in addition to providing the right answer.
What's more likely happening is that "that's just how it works" is either simply true or is widely accepted as being true. They're not answering because this guy told them that it was true; they're not answering because they believe it's true too. Even if it isn't true, if it's widely accepted as such, that likely means most people who have had that problem believe the conventional wisdom and thus don't have an answer. Either way, nobody is answering because they don't have an answer.
So I contest the idea that the answer is what makes your question "essentially dead". It's more likely that your question is dead on its own and the answer is just acting as the coroner. Generally speaking, a diagnosis of "being dead" doesn't need a second opinion ;)
Now, to the substance of your question. If you find your questions or answers frequently harassed by a user, even if that harassment is polite or even friendly, you should flag one of their comments for moderator attention. When you do so, you need to explain clearly the problem.
When you do so however, you should be really sure that the pattern of behavior is abusive. In the above case, if I were a moderator, I wouldn't accept that flag, due to lack of evidence. You absolutely should not get basic facts wrong like "Every. Single. Time." being in reality "less than half of the 8 questions I asked in the last year".
