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I block them. Boom, done, no regrets. I can try to spend minutes crafting a response to each one, but the odds of getting thru this way are vanishingly small, and usually they just post stuff like that specifically to irritate. Not worth your time IMO.
Absolutely on board with this approach. Anyone who holds a firm belief that NASA is a conspiracy is too far gone for reason, certainly in the context of a YouTube or Twitter comment.
