To see how skewed the debate about left anti-Semitism has become, look no further than the spat over Jeremy Corbyn’s comments about Zionists failing to understand English irony. This latest stage in the row over Corbynista prejudice confirms that very few people take anti-Semitism seriously. So on one side we have the anti-Corbyn lobby blowing the problem of Labour’s racism out of proportion, largely for political ends, and on the other we have Corbyn devotees who seem determined to deny that such a racism problem exists. One side politicises, the other denies. And what gets lost between these two columns of cynicism is a proper reckoning with the new manifestation of Jew-hatred.