Not gonna say what it was because I don't want you actively seeking it out, but if you watch BitChute you might have seen it.

Ah yes. Bitchute: where all the internet sludge that other platforms refuse to platform pools into a nice and tidy cesspit.

And by “nice and tidy,” I mean “sprawling and chaotic,” just like the mental states of all those who spend too much time exposing themselves to such nonsense.

Odysee is the better platform.

Wait, people actually deny the Holocaust happened??? Wtf??????

A disappointingly, mind-numbingly large amount of people do. Usually said people have connections to neo-Nazi, anti-Semitic, or other racially motivated hate groups.
https://en.wikipedia.org/wiki/Holocaust_denial
Notable deniers include
https://en.wikipedia.org/wiki/David_Irving
https://en.wikipedia.org/wiki/Fred_A._Leuchter
https://en.wikipedia.org/wiki/Ursula_Haverbeck
and whoever the heck made the absolute travesty of a "documentary" that I watched.