Welcome to the club. The line forms to the rear!
;-)
Generally speaking, I've found that ignoring the trolls gives them too much leeway.
Then again, it's counterproductive to go endlessly around the merry-go-round with them.
So instead, I make sure that they're dealt with enough on each thread that any lurkers (present or future) will have no trouble recognizing that they *are* trolls (or cranks). After that, it's safe to let them sputter on unanswered, no one will mistake their posts for anything worth believing.
Although I must say, I am often reminded of Red Skelton's best barb: "Little do you know how little you know."
It's amazing how much "supporting evidence" the trolls/cranks will gather for their pet theories (by hunting for and retaining *only* those things which lend some sort of support for the theory) -- while remaining blissfully unaware of the vast mountains of contrary evidence that have been patiently collected by serious scientists through the centuries. (Or being aware of, but mightily staving off with endless cries of, "lies, all lies!")