For more than a decade, seasoned far-left internet-surfers have enjoyed the scabrous, hilarious, tasteless wit of Jewdas, a social-media-savvy radical — and tiny — Jewish group. Had it been suggested a week ago that this minute, loose grouping of righteously furious Bundist pranksters would be national, even international news, it would have seemed impossible, if a delightful thought. But a week, these days, is a particularly long time in politics. Thus it is that Jeremy Corbyn attending a Jewdas-organized Seder in North London is being depicted as an insult to Jews.

For approximately two years, the Labour leadership has been assailed by charges of tolerating, or showing a blind spot for, antisemitism. For the first time in that whole period, the scandals have drawn blood. Corbyn’s attendance at the Jewish festival — his hosts report being delighted that he brought his own homegrown horse-radish — is, by deranged political judo, being cited as evidence for antisemitism.

Leading up to this, Corbyn has been forced to apologize for a Facebook comment from several years ago, defending an antisemitic mural by the artist Mear One, and to issue a sweeping statement addressing the problem of “pockets of antisemitism” in Labour. Shadow chancellor John McDonnell, and Momentum, have also put out statements saying that antisemitism in Labour is a real problem, not to be dismissed. Unfortunately, many people refused to see anything antisemitic about the mural, featuring a classic conspiracy theory trope about rich Jews. Some Corbyn supporters signing a petition defending him against a “very powerful interest group,” toxic language to use in this context.