T,D said " It's not possible to prove a negative. Burden of proof rests on the claimant. " I said something similar in an earlier Post, but I stress, do NOT waste your time disproving stuff, let them lay out their case, and demolish it.
A word of caution, in my early days, I did this , several times with one guy, and he kept coming back with more nonsense, until I said , " Look , hang on Bro, I demolished your earlier stuff, how much longer shall we go on before the penny drops with you ? " a bit rude perhaps, but it worked, sort of, he never came back. But they tend to do that, ignore the significance of what you have destroyed, and think if they can prove something else is true, that is you sorted, but NO ! the stuff that I have proved wrong, without going further, proves you thick JW's do NOT have the truth !