To be honest the guy's right. This is pretty much a trainwreck to me; I can't seem to look away. Still, I've actually learned a few things reading flattard and anti-flattard comments on YouTube, like the Eotvos Effect -- small but measurable changes in the weight of something depending whether it's moving with or against the earth's rotation, consistent with the predictions you'd make from the assumptions that the earth is approximately spherical, of radius approximately 6400km (can't be bothered to look up more exact numbers) and rotating at approximately 15 degrees per hour. This simultaneously debunks two of their talking points: "the earth has never been proven to rotate" (based on misrepresenting the Michaelson-Morley experiment) and "if the earth is spinning 1000 miles per hour, why aren't we thrown off?" (by showing what the actual effect of that rotation is -- measurable but small compared to the effect of gravity.) Still, there are a lot better things to do with my time. But hey, I'm not perfect.