Mike-You actually covered just about every point possible in your last post. So David can't get over the fact that you called his essay junk, fine. I've told him, personally off the board, that I thought the same thing about his essay for reasons that might be a bit different than yours, but I told him nonetheless. However, that comment was directed towards him as well, not just you. The both of you act like children, your sharp remark to Tom MacWood about "whether you like it or not" starting the whole matter and now its just spiraled downhill quickly like it tends to do, and did on ever how many other threads. At this point, this thread has degenerated into a two-way pissing contest between the two of you, the other major combatants from other threads haven't dared to wade into this water.
And yeah, maybe you should just ignore him, if thats the case. If you quite responding to him, he'll run out of stuff to say eventually. Thats what I would do.