OK, where do we start?
(1) They play shots of storms and melting ice over the interview as if to imply "man-made global warming is happening, this guy is obviously a crackpot". There is no published data that shows links between storms and man-made global warming.
(2) They make fun of his eyes, which is from a medical condition known as "Graves Disease"
(3) They dismiss his credentials by referring to his having been once an editor of a catholic newspaper, even though he was actually a policy advisor in Margaret Thatchers government.
(4) They state that he is "not a scientist, unlike James Hansen" Lord Monckton has scientific papers published in peer reviewed science journals.

Lord Monckton is correct in his statement about Hansen's extreme views on those who disagree with him.
See this Facebook page which gives some idea how extreme Hanson's views are.
He famously describes coal trains as Death Trains and uses many other extremist tactics to get his view across.
This is all very well, we are entitled to free speech, but Hanson is a lead contributer to IPCC reports and a major driver in the so-called science of Climate Change.
I say "so-called" because any true science is constantly challenged in its theories. The fact that this has not happened is quite clear from reading the CRU "Climategate "emails. The scientists at the centre of the AGW theory have created their own world of self-peer-reviewed literature and completely locked out all dissent.
The public are waking up to this and media companies like TVNZ are accomplices to this crime.
Given that we have extremists like Hansen driving multi-trillion dollar carbon schemes that will tax many out of existence, it seems reasonable that Lord Monckton should get a fairer hearing.