Prince Zeid Ra’ad al-Hussein singled out Dutch far-right leader Geert Wilders, saying he used bigotry as a political weapon.
He said he and others, including Donald Trump and Brexit campaigner Nigel Farage, used the same tactics as ISIS.
Zeid Ra’ad al-Hussein was addressing a security conference in The Hague.
In an election manifesto published last month, Geert Wilders said that if elected he would close all mosques and ban the Koran and Muslim immigrants.
Geert Wilders’ Freedom Party (PVV) is leading opinion polls in the Netherlands before the 2017 election.
He also addressed the US Republican Party National Convention in Cleveland, Ohio, last month.
Donald Trump’s campaign has been marked by hard-line rhetoric on immigration and social issues.
Zeid Ra’ad al-Hussein told the inauguration of the Peace, Justice and Security Foundation, that he wanted to address his statement to “Geert Wilders, his acolytes, indeed to all those like him – the populists, demagogues and political fantasists”.
He said: “I am a Muslim, who is, confusingly to racists, also white-skinned; whose mother is European and father, Arab. And I am angry, too, because of Mr. Wilders’ lies and half-truths, manipulations and peddling of fear.”
Zeid Ra’ad al-Hussein described the PVV manifesto as “grotesque” and said Geert Wilders had much in common with presidential hopeful Donald Trump, Hungary’s PM Viktor Orban, France’s National Front leader Marine Le Pen, and former UKIP party leader Nigel Farage.
He said all had similarities to the ideology espoused by ISIS.
Zeid Ra’ad al-Hussein said: “All seek in varying degrees to recover a past, halcyon and so pure in form, where sunlit fields are settled by peoples united by ethnicity or religion. A past that most certainly, in reality, did not exist anywhere, ever.”
He added: “Make no mistake, I certainly do not equate the actions of nationalist demagogues with those of Daesh (ISIS). But in its mode of communication, its use of half-truths and oversimplification, the propaganda of Daesh uses tactics similar to those of the populists.”
Zeid Ra’ad al-Hussein said that the “humiliating racial and religious prejudice fanned by the likes of Mr. Wilders” had become official policy in some countries.
“We hear of accelerating discrimination in workplaces. Children are being shamed and shunned for their ethnic and religious origins – whatever their passports, they are told they are not “really” European, not “really” French, or British, or Hungarian. Entire communities are being smeared with suspicion of collusion with terrorists,” he said.
Zeid Ra’ad al-Hussein warned that an atmosphere “thick with hate” could quickly descend into “colossal violence”.
“A decade ago, Geert Wilders’ manifesto and Cleveland speech would have created a worldwide furore. Now? Now, they are met with little more than a shrug, and, outside the Netherlands, his words and pernicious plans were barely noticed,” he said.
“Are we going to continue to stand by and watch this banalization of bigotry, until it reaches its logical conclusion?”
In March, Geert Wilders appeared in court charged with inciting hatred against Moroccans.
Geert Wilders’ full trial is due to start on October 31.
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