I saw the same documentary. They were talking about people who disagreed with him when his ideas weren't proven.
Was this documentary called something like The Hawking Paradox, or something similar?
I remember recording something like that and watching it, it included at the end where Hawking was like "IT'S PARALLEL UNIVERSES LOL"
It was about black holes and how can the "information"(planets matter whatever) disappear, I think they called it the Information Paradox.