Fair enough. That's her opinion and, as Clint Eastwood pointed out in a Dirty Harry movie, "Opinions are like assholes: everybody's got one".
In his feline way, Key linked it to Catton's Green Party leanings and there was indeed an echo of the slightly unhinged rhetoric you might hear at a Greenie gathering: "[The Government] would destroy the planet in order to be able to live the life they want."
She referenced the cultural cringe which, regardless of what you might have heard to the contrary, is alive and malign and living in this country.
She criticised the Government's lack of support for cultural and intellectual pursuits, a valid gripe but, as Hulme observed, "Whatever country a writer was from, they would be disillusioned with government support for the arts".
Catton was discomforted by the way her Man Booker triumph was seen as a New Zealand award, suggesting that Kiwis are suspicious of individual achievement. This may reflect her experience but, from the outside looking in, she seems to be reading too much into the media's tendency to play up the local angle to get their readers' or audience's attention.
I wouldn't have thought the claiming of her as a New Zealand writer was essentially different from the "our Russell Crowe" syndrome or the headline on a story about the death of a Lower Hutt-born, British-raised woman: "Kiwi backpacker found dead in Thailand".
If some Kiwis have been too eager to bask in Catton's reflected glory, as of August 2014 we had purchased 120,000 copies of The Luminaries which amounted to 20 per cent of worldwide sales. (It's still top of our bestseller list.) Given it's a long and demanding read, that in turn suggests we're not quite the knuckle-dragging philistines of Duff's imagination.
She raised the Tall Poppy Syndrome. I'm normally wary of those who play the TPS card with its implication that, once a person is deemed to be a success, they should therefore be above criticism.
But she did so in the context of her failure to win the big prize in the 2014 Book Awards: "There was this kind of thing that now you've won this prize from overseas, we're not going to celebrate here, we're going to give the award to someone else."
(The Luminaries won the fiction category but the overall Book of the Year was Jill Trevelyan's non-fiction work Peter McLeavey: The Life and Times of a New Zealand Art Dealer.)
The awards organiser thought she'd shown "bad form" by putting down the judges. I disagree.
I think Catton had every right to expect The Luminaries to be Book of the Year; I reckon it was a no-brainer; I believe the calculated snubbing - what else was it? - of this extraordinary and unique work of fiction will be a source of embarrassment for New Zealand literature for years to come.
Finally, while I understand her publisher Fergus Barrowman's protectiveness, I don't think this kerfuffle proves "we have a real problem with public conversation in this country".
But being earthy, egalitarian little New Zealand, the conversation isn't necessarily going to be highbrow. That's just the way we are.