I've seen a few things he's promoted. I file it in the category of people like Richard Fenyman.
https://thebaffler.com/outbursts/surely-youre-a-creep-mr-feynman-mcneill
On the basis of the evidence, Fenyman was a horrible disgusting evil sort of man. His accomplishments, however profound they are, and his ability to communicate, however fantastic it was, do not counter or make up for the horrible attitudes and behaviors he engaged in. He sustained a culture that continued with people like Lawrence Krauss being a spectacularly pathetic person as covered her: https://www.theatlantic.com/science/archive/2018/10/lawrence-krauss-sexual-misconduct-me-too-arizona-state/573844/
I watched the Challenger Disaster with my wife, which essentially had Fenyman as the hero. And he was the hero in that incident. But I made sure she knew the other side also.
And that's pretty much what I do with Cleese. I don't have an answer. I don't know of any solution. Humans gotta human. But I as an individual can a) watch myself for hubris and avoid dismissing anyone, even those with whom I disagree, as being somehow less than I am as a person, and b) take a stand to demand that everyone, myself included, to be better.
I wish I had more to offer. Best I can do.
@lavahot
That is very unfortunate to hear :( For some reason I would have expected the opposite out of him.
@Romaq