So, to recap the effects of that Daily Mail article on Ralph Miliband: It robbed the Conservative party conference of the headlines it expected – it was ahead of any of their policy announcements all yesterday in most news bulletins, across most channels. It reinforced Ed Miliband's image, for the second week running, as someone of integrity who stands up to bullies. It secured him sympathy and support from most political opponents. It caused a social media reaction which refreshed everyone's memory about the Daily Mail's historical links with Mosley and Hitler. It even managed to revive interest in the Leveson inquiry's recommendations. All in all, it was the journalistic equivalent of a glorious Stan Laurel pratfall.

It also marked the moment when Alastair Campbell singled himself out as the natural successor to Jeremy Paxman. You know, the Paxman of old, when it was his line of questioning which caused a stir, rather than the configuration of his facial fuzz. It was all at once both refreshing to see someone properly "grilled" on Newsnight for the first time in months, and depressing that it had to be by another guest.

It was also, personally, a rather odd moment to find oneself rooting for Alastair Campbell. You got a glimpse of how utterly terrifying he must have been to deal with, when he was Blair's press pointman. How overwhelming and irresistible. A glimpse of how his ability to grind down anyone expressing a contrary view may have contributed to both the success and the hubris of the Labour party at that time. At the same time, as someone hoping that Cameron will be relegated to oblivion at the next election, I had to admit: if I could employ him to help bring that about, I would have to consider it. I may not like him, but – boy – is he good at his job!

Within 10 minutes, he got further than all the other television news political editors and correspondents put together did over 24 hours. He secured an admission from the Mail's deputy editor, Jon Steafel, that, at the very least, using a photograph of Ralph Miliband's grave was an "error". He succeeded in exposing internal rifts within the Daily Mail, by outlining the areas where even Paul Dacre's deputy refused to support him. The coup de grace was the phrase "the Daily Mail is the worst of British values, posing as the best". I suspect it will follow the Mail for many years to come. It was a bravura performance.

He even got close to unpacking the wider point. How is it that one can extrapolate hatred of Britain from criticism of its institutions? It seems that sections of the press (and, I'm sure, the public) are never far from the McCarthyist view, that wanting to change the way the state works makes one an enemy of the state. But there is a further point bubbling under the surface. Implicit in the Daily Mail's venom is the idea that being republican (in the wider, rather than US, sense), being suspicious of organised religion, being a pacifist or a socialist – all these things, which are upsetting to the Mail and its readership – become a cardinal sin if you are also a foreigner.

As a foreigner with strong opinions, I have come across this hundreds of times, in various permutations. As an immigrant one has no right to criticise any aspect of the UK. Regardless of how long one has been here, regardless of the validity of one's opinion, regardless, even, it seems, of serving in the military during a war, the immigrant's stake is limited. He is tolerated, but should watch himself. The invitation can easily be withdrawn. He should be grateful unconditionally. That Daily Mail article is just a longer version of, "If you don't like it here, you can fuck off back to your own country". It is an attitude that is not only still prevalent, but permeates the political rhetoric on Europe, trade, foreign policy and immigration.

It is this snobbery, resistance to new ideas and sense of inflated ego that are truly holding Britain back from being all it can be. It puts me in mind of something the American journalist and essayist Sydney J Harris wrote: