It is becoming a daily event. Whether it is the Swiss fencing
team turning away from the Israeli flag during Hatikva in the medal ceremony, or
Kneecap defending their "Fuck Israel" messaging at Coachella, or Iceland joining Spain
calling to ban Israel from Eurovision, this goes beyond "normal" antisemitism and turns antisemitism into an excuse to say "look how moral we are to publicly oppose Israel."
This sort of virtue signaling has been around for a while, and it has antecedents in history with more classic forms of antisemitism.
John Chrysostom, in the 4th century CE, said "The Jews are the most worthless of all men. They are lecherous, greedy, rapacious… Do not be surprised that I call the Jews pitiable. They really are pitiable and miserable." He therefore called on Christians to publicly denounce Jews to deter other Christians from observing Jewish rituals and holidays.
The Crusaders positioned their attacks on Jews as moral imperatives.
Pope Innocent III, who organized one of the Crusades, said “the Jews, by their own guilt,” must be “consigned to perpetual servitude because they crucified the Lord.”
Thomas Aquinas in 1271 justified stealing from Jews: "The Jews by reason of their fault are sentenced to perpetual servitude and thus the lords of the lands in which they dwell may take things from them as though they were their own."
In these our kingdoms there were some wicked Christians who Judaized and apostatized from our holy Catholic faith, the great cause of which was interaction between the Jews and these Christians.... they have had means and ways they can to subvert and to steal faithful Christians from our holy Catholic faith and to separate them from it, and to draw them to themselves and subvert them to their own wicked belief and conviction, instructing them in the ceremonies and observances of their law... and persuading them as much as they can to hold and observe the law of Moses, convincing them that there is no other law or truth except for that one. ....Whenever any grave and detestable crime is committed by members of any organization or corporation, it is reasonable that such an organization or corporation should be dissolved and annihilated and that the lesser members as well as tile greater and everyone for the others be punished, and that those who perturb the good and honest life of cities and towns and by contagion can injure others should be expelled from those places and even if for lighter causes, that may be injurious to the Republic, how Much more for those greater and most dangerous and most contagious crimes such as this.
French antisemite
Édouard Drumont wrote in 1898, "If the circumstances were such that I was invested with an authority that would permit me to save my country I would turn the big Jews and their accomplices over to a court martial that would have them executed....They are preparing to liquidate France the same way they liquidated Spain."
The Soviet Union often positioned Judaism as well as "Zionism" as threats that must be uprooted for the defense of the socialist movement. In 1963 the Ukrainian Academy of Sciences published "Judaism Without Embellishment" which positioned Judaism as a threat to socialism, including cartoons that conflated Jews with "Zionists" and capitalists.
Yuri Ivanov, in Beware: Zionism! (1969), also positioned Zionism as the enemy of socialism: “The anti-human reactionary essence of Zionism is its overt and covert fight against freedom movements and against the USSR… Zionism, as the front squad of colonialism and neo-colonialism, actively participates in the fight against national liberation movements of the peoples of Africa, Asia, and Latin America, serving as a tool of imperialist subversion against the socialist camp.”
Interestingly, I have not found any researcher who ever looked at antisemitism through the prism of virtue signaling and moral imperatives, as opposed to simply attacking or hating Jews.
But it has been there throughout history, and it is being repeated today.