@PinkCrayon
Lists of all Jeremy Corbyn's antisemitic statements and actions have been posted on Mumsnet repeatedly.
There is plenty of information available online.
The problem presumably is that you're not Jewish and you don't understand antisemitism, so you can't see the antisemitism in the things that Corbyn says and does. You haven't had ideas such as these used to justify the murder and expulsion of your ancestors throughout history.
Modern-day, left-wing antisemitism doesn't manifest itself in people openly saying 'I hate Jews.' It its revealed through people's conscious or unconscious use of millennia-old antisemitic tropes.
For example, a trope that has been used to justify persecution of Jewish people throughout history is the dual loyalty trope. This is the idea that Jews are never loyal to the 'host' country we live in - our true loyalty will always lie with 'world Jewry' and, since 1948, Israel.
This trope has been used to 'other' Jewish people throughout history. It can be seen in the 'stab in the back' myth perpetuated by Hitler - that Jewish Germans were traitors who had forced Germany out of WW1 just as it was about to win. It was this idea that was used to justify depriving Jewish Germans of their citizenship. I've attached a postcard from the time that displays this trope.
Therefore, when Jeremy Corbyn says things like 'Zionists cannot understand English irony, despite having lived here all their lives', this will make most Jewish people extremely uncomfortable. To us, it sounds like he's saying that no matter how long we have lived in the UK, we will never be truly British/English. That our residence here is temporary. That we don't belong.
The same words probably wouldn't even register with you, a non-Jew with no direct experience of the dual loyalty trope. But the vast majority of Jewish people will hear what I hear.