Sorry for the off-topic post after so long, but this is racism, plain and simple. This is not Corbyn just associating with an antisemite, or having dodgy allies, or going to antisemitic meetings. This is Corbyn being personally antisemitic.
If you did this to any other religion or race it would be called racism – imagine if he called a black MP the MP for Africa, or called Sadiq Khan the Mayor of Londonistan. Corbyn is being a racist bully.