Even worse, it was at an event highlighting his party's moves to rid itself of antisemitism.
Via The Gaurdian:
Jeremy Corbyn was engulfed in a fresh row over Israel when he appeared to compare the government of Binyamin Netanyahu to Islamic State at the launch of an independent review into antisemitism in the Labour party.
In prepared remarks, Corbyn said: “Our Jewish friends are no more responsible for the actions of Israel or the Netanyahu government than our Muslim friends are for those of various self-styled Islamic states or organisations.”
Later, in response to a question met with jeers from an audience with a strong pro-Corbyn presence, the Labour leader denied he had intended to make such a comparison.