I'm speaking from a personal opinion from following the dude on social media for years. Claims to fallacy notwithstanding (the dreaded fallacy fallacy), what are you objecting to? People having a negative opinion about a famous comedic actor?Love how all these comments about John Cleese are not remotely addressing anything he was saying in the interview (as reported here), but just bashing him for being an old unfunny man. Is that not the old ad hominem? Kind of looks like it to me.
If he'd said "they're not booking me anymore because my comedy is too edgy" then maybe these would be meaningful retorts, but they're not meaningful retorts to "I'm choosing not to do them because they're getting offended by everything and it's insufferable".
I wish that in 50 years time, I would be allowed to criticise a public figure without someone going "umad" or "ad hominem", but I guess given how embedded such a reaction is in society now, I have no realistic hope of that kind of pedantry dying out.