His critics homed in on Jewdas' anti-Israel views, and accused Corbyn of "baiting mainstream Jews".
"It is not for non-Jewish people, in criticising Corbyn's attendance, to determine what is and isn't a legitimate expression of the Jewish faith".
The group also said that protests against Corbyn for failing to tackle antisemitism are "faux-outrage greased with hypocrisy and opportunism".
Mr Lansman, who is Jewish, said: 'It was his night off, he had nothing in his official diary, his office didn't know he was there. He issues empty statements about opposing anti-Semitism, but does nothing to understand or address it.
Corbyn said the event was "a celebration of Passover, which I celebrate with young Jewish people from my own community and my own constituency", the Guardian reported.
Schooled in left-wing, protest politics, Mr. Corbyn's worldview seems to have remained much as it was when he entered Parliament in 1983, at the beginning of a long period on the fringes of the Labour Party. Which means: Jews... To make out that it's somehow anti-Semitic for him to spend Seder with them just because they're far left is balls.
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"Jeremy Corbyn is a man of his political era and hasn't got the intellectual flexibility to move on from that, and to question some of his views", Professor Fielding said.
Nevertheless, senior leaders in the Labour Party appeared to have realized the damage the issue was inflicting, which may be why Momentum issued a declaration on Sunday acknowledging worries about anti-Semitism.
Jeremy Corbyn, the embattled leader of the opposition British Labour Party, was again locked in conflict with the country's Jewish community on Tuesday - just days after publicly admitting that "antisemitism has occurred in pockets within the Labour Party, causing pain and hurt to our Jewish community", and pledging to "stamp this out from our party and movement".
Speaking in Swindon, Corbyn said that he "learned a lot" at the seder.
After the Seder, Jewdas tweeted that "tonight reminded us that the reasons we're Jewish are the same as our reasons for being revolutionaries: our commitment to making this world better than it is now".
Comedian David Baddiel, who has been at the forefront of the debate over anti-Semitism in the Labour Party, rejected suggestions that Jewdas was "despised" by other members of the Jewish community. "Isn't that a good thing?"
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Jon Lansman, found of Momentum, a grassroots organization that backs Corbyn and the Labour party, in an interview with BBC Radio 4 played down the gravity of Corbyn's attendance at the Seder.
The Jewish Labour Movement said Jeremy Corbyn's attendance at the event "topped off the worst week on record of terrible relations between the Labour Party and the Jewish community".
Karen Pollack, chief executive of the Holocaust Educational Trust, tweeted that Corbyn's action "was clearly deliberate".
However, Stephen Pollard, the editor of the Jewish Chronicle newspaper who has been described as a "non-Jew" by Jewdas, told Mr Arkush his comments were "awful".
ReutersA spokesman for Jeremy Corbyn said the party would not tolerate racism among its candidates.
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