It is compelling him to behave in an involuntary manner, thus coercion.
https://en.wikipedia.org/wiki/Coercion
Advertisers are attempting to gain benefit via coercion, so it is extortion.
https://en.wikipedia.org/wiki/Extortion
So far as we know, they are not threatening to air secrets, so it is not blackmail.
https://en.wikipedia.org/wiki/Blackmail
So it was a bad choice of language, but frankly it doesn't seem "incoherent," just off by a hair.
It also does not seem petulant, though telling advertisers to F themselves through that sneer of his certainly is.
> he keeps saying and promoting repulsive stuff
Yes, and the responses to him seem repulsive, too. Chicken? Egg? I don't care.