From the video paraphrased transcript:
[...]
But there is a good idea at the back of political correctness; but it gets taken ad absurdum
[...]
if you find society is being run by the touchy[iest] members, then in a sense that's a bit sick. Because you're trying to take as the general standard is the standard of those people who have the greatest problem controlling their emotions.
This is in a sense the No Child Left Behind Act (reasoning) applied to political correctness. Creating policy with good intentions (but in actuality having gone awry) often is termed "Campbell's Law":
"The more any quantitative social indicator (or even some qualitative indicator) is used for social decision-making, the more subject it will be to corruption pressures and the more apt it will be to distort and corrupt the social processes it is intended to monitor."
Likewise...
The cause of the trouble with PC isnt the PC "police". These nutters have always been there and will always be there. The trouble is caused by the reasonable people who lack the balls do deal with PC nutters accordingly. (parent commenter)
...You are right in pointing out the lack of individuals willingness to argue why policy such as this is ineffective and often malevolent.
What we are left with irrational policy, formerly logical fallacies, such as a "false consensus", Reductio Ad Absurdum, or false dilemma. ("False dilemma" is an issue in schools, for example, where zero tolerance policies remove the humanity from administrator's job.)
Politics being the codification of whatever was already considered means a lack of individuals who expose radicalism and promote the moderate consensus may mean bad policy and legislation. The extremism is the loudest and often consequently malevolent when unchecked. Normalcy, specifically surrounding the current status quo, does not cause protesting, debates, awareness, or urgency.
From news, to lobbying, to political action, to scientific literacy, and general hysteria, humanity is hardly using the internet to its potential (or purpose); how we consume and discuss information in today's world is medieval at best.
When John Cleese mentioned "that's a bit sick", there may be some wisdom in his arbitrary pronoun. An informed populace capable of basic intellectual reasoning is paramount to our progression and perhaps survival as a species.