As one who advocates formally and informally for Israel, I have heard the full gamut of misconceptions and slanders that are aired by those opposed to the Jewish state. Over time, my skin has thickened; people can throw whatever baloney they want my way.

Except… there is still one anti-Israel argument that makes my jaw drop. And it is one that is made with unfortunate frequency. It is the "they-of-all-people" argument: the suggestion that the Jews, having faced extraordinary persecution, should know better than anyone not to be oppressors.

Put aside for a moment that the "oppression" which proponents of this argument are accusing Israel of committing is usually imaginary. When directed by gentiles towards Jews, the "they-of-all-people" argument is in its very essence so fundamentally ill-judged and unjust, and voiced with such a breathtaking lack of self-awareness, that my spirit flags when I hear it.

Where to begin in response? The heroic Howard Jacobson made a fine start when he proposed that "they of all people" is the natural successor of Holocaust denial. He wrote that the argument leaves the Jewish people doubly damned: to the Holocaust itself and to elevated moral scrutiny as a result of it.

I agree, and I would go further. I contend that, as a result of the Holocaust and what preceded it, it is we gentiles who should know better. The Holocaust followed centuries of slander, persecution, violence and murder committed by gentiles against Jews. So it is not you who have an increased responsibility to behave morally, but us.

It is we gentiles, of all people, who should know better

For instance, something that we gentiles should know better than to do is lazily accuse Jewish people, or the Jewish state itself, of any misdemeanour. We have seen what centuries of slander against the Jewish people led to during the 1930s and '40s. We see the hatred, heartbreak and bloodshed that such anti-Jewish libels continue to provoke, particularly in the Middle East.

Yet much of the world still continues to delight in damning Israel with indecent haste. From Al Dura (the false claim that Israeli forces murdered a boy in Gaza) to Jenin, from the Goldstone Report to the Gaza flotilla; time and again the world has found Israel guilty of a particular crime before all the evidence was available. When the full picture emerged and exonerated Israel it was too late to undo the damage. We gentiles, of all people, should know better.

It is also us, of all people, who should know better than to expect Israel to deal with the Iranian nuclear threat alone.

The world's ceremonies and gestures of regret over what happened in the Holocaust would carry an increased weight of sincerity were they to be matched with robust support for Israel as the countdown to a nuclear-armed Iran, whose leader denies the Holocaust while promising to commit a second one by wiping out the Jewish state, continues.

World leaders should be sincerely standing shoulder-to-shoulder with Israel's government as it decides what to do, not dawdling on the sidelines, waiting to wag their collective, condescending fingers yet again.

Let us strip the "they-of-all-people" argument down to its very basics: gentiles telling Jews that we killed six million of your people and that as a result it is you, not us, who have lessons to learn; that it is you, not us, who need to clean up your act. It is an argument of atrocious, spiteful insanity. Do not accept it; turn it back on those who offer it. For it is us, not you, who should know better.

Chas Newkey-Burden blogs at oyvagoy.com. His next book, with Kelvin Mackenzie, 'The Twitter History of the World', is published on August 6