I asked him “what color were the clouds back then?” and he said they were white. I asked him what happens if I take an orange light and light up something that’s white with it. He ignored me. He went on about how everyone in his age group remembers the Sun being orange, and by me questioning him, I’m calling him and all his peers liars and I’m stupid because I’m younger than him and vaccinated.
The nature of reality is such that you can believe a very silly thing and have it impact your life in no meaningful way. People have been wrong about the nature of the universe for millennia and continued to get by. The oddball who believes in native moonlight and stargates isn’t going to benefit tangibly for being correct or suffer tangibly for his misbelief. In many cases - thanks to the proliferation of internet subcommunity echo-chambers - they may actually suffer (socially) for reconciling their beliefs with reality if they can’t bring their friends along for the ride.
But, again, when they have extremely limited influence over their surroundings (this guy is not, presumably, running an astronomy lab or charged with funding improvements to municipal mass transit) their zany beliefs don’t really matter. Correctness doesn’t benefit them and incorrectness is more fun.