I suppose this is supposed to be mocking Joe Rogen and would be funny if it made sense. But Ivermectin is also a human medication. He got a prescription from a doctor (not a vet) and he got medicine manufactured for human use. Ivermectin has an excellent very side effect free history and has been used in many human studies on Covid with good results, which is likely why the CDC despite incredible bullshit and pressure from the pharmaceutical industry is going to begin studies on humans. CNN and the fact checkers had their heads up their asses. If the idea was that Ivermectin, in this case, would be being used off-label, well it would be off-label for horses - since it's a dewormer for horses - so the whole mockery makes no sense. And, of course, off-label use is very common amongst doctors. And sure, this can be abused, but focus on the pharmaceutical companies who try to stretch the off label uses into the danger zones more than any other party.

CNN had their head medical person on Joe Rogen's show and this doctor admitted it was incorrect of CNN to call it horse medicine. Though, man, he was very evasive until finally admitting the obvious. It's in the PDR for god's sake. It's really amazing what can be repeated over and over as if it's true by people claiming to represent science and rationality. They'll call this the Irony Age in the future.

How to present nonsense to, and spread fear among, the gullible ...

Official Government Reports suggest the Fully Vaccinated will develop Acquired Immunodeficiency Syndrome by Christmas (Oct 27, 2021)

The executive summary: if you had COVID-19 vaccines, then you'll probably have AIDS before the end of the year.

Is it even worth it to engage with these people?

They're immune to facts and they will not change their minds no matter what happens, which is interesting psychologically. But should we engage for the sake of others who are rational yet "on the fence"? — Xtrix

Yes but in asymmetric way and always for fun because that almost always works.

By "asymmetric" I mean you never engage into flat-earther discussion by either denying or supporting their flat earth ideas, but rather accept their game and start fiercely preaching aliens.

You said "for the sake of others who are rational", you bring fallacy to attention in an interesting and funny way but in same time irritate flat earthers.

Regular base rate fallacy. How stupid can they get?