In a speech, the comedian is reported to have likened the principle of newspaper self-regulation to murderers wanting to police themselves.
He also accused editors of “almost entirely cold-blooded lying” in respect to claims that further regulation would hinder press freedom.
On his blog, Peter wrote: ” Tarring us all with the same big, clumsy brush has always been one of the concerns surrounding the on-going debate over press regulation – and John Cleese is becoming chief tar-brusher.
“As much as I admire his work, Cleese is in danger of becoming more over-the-top and disturbingly manic than Basil Fawlty after a bad day at the hotel.”
He added: “We need a sense of perspective: an acceptance that a minority of national journalists behaved abominably, but without leaping to the madcap conclusion that every editor in the country is a terrible, shameful monster who deserves to be tarred and feathered.
“I know lots of editors – most of the them running local papers, making a genuine difference to their communities – and I wouldn’t describe any of them as cold-blooded liars.”