Owen Jones has been very good about it - he summarises the arguments and why Ken needs to go very well, on his facebook page.
I can't imagine Ken cares overmuch. He has neanderthal views on Jewishness which make him unconcerned about giving a platform, and more, to hideous scum who fantasise about killing Jews, and those people are hardly milk and water liberals when it comes to homosexuality, either. Ken's friends wouldn't like the cut of Owen Jones' job, as out gays are another group they want to kill.
Remember, Corbyn and Livingstone are both happy to take money from violent homophobic and anti-Semitic governments. They variously do paid work for Russia Today, the propaganda arm of Putin, and Press TV, the propaganda arm of Tehran. So their willingness to cosy up to people who hang gays from cranes is matched only by their willingness to cosy up to people who want to kill Jews on an industrial scale.
We hung William Joyce for appearing on radio stations broadcasting propaganda for our enemies. Corbyn and Livingstone get elected, doing the same.