More info here:
https://youtu.be/qrKoqwu94HU

Do not demand apologies. I will not apologize for mocking stupidity. If you choose to deny science and common sense and go build yourself an unsafe rocket to launch yourself thousands of feet into the sky with no unmanned testing you deserve an award. The Darwin Award.

I guess I should have stressed this more. I am not purely mocking his belief of flat earth. The majority of the mockery is directed at his thoroughly unsafe rocket. But I don't believe most are reading this far anyway so not a big deal.

Section 107 of the U.S. Copyright Act states:
“Notwithstanding the provisions of sections 106 and 106A, the fair use of a copyrighted work, including such use by reproduction in copies or phonorecords or by any other means specified by that section, for purposes such as criticism, comment, news reporting, teaching (including multiple copies for classroom use), scholarship, or research, is not an infringement of copyright.”

This video is:
Criticizing stupidity
Commenting on stupidity
Reporting News of stupidity
and teaching people not to be stupid.