One question is: can you stop your friend believing these conspiracy theories? Regrettably, almost certainly not, at least not without a huge investment of time and patience.
People are free to think whatever they want and some of us put that freedom to the weirdest uses. At least we can be thankful the conspiracies your friend has latched on to are about objects in the sky and not, say, which reptilian species is secretly controlling things.
Often these beliefs don't behave like regular beliefs; they don't arrive by evidence, don't leave by it, and it often seems to be a kind of play or entertainment more than a bona fide commitment to truth.
You don't need them to grasp you're wrong. You just need them to grasp I don't want to talk about this.
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