No, sorry - "the antisemitism thing" is very real. I was really enthused by Corbyn initially, and didn't initially give the allegations much credence but it was his defence of that "Freedom for Humanity" mural that brought it home for me.
At the time that became public, I only knew the basics of antisemitism but that's all that was needed to recognize the mural as obviously antisemitic (and you'd think Corbyn would be far more aware of the tropes given his decades of involvement in discourse re. Israel).
His office's initial response - that Corbyn was defending free speech - was more like something you'd hear from the far right.
Then, when Corbyn's response came, it lacked any real credibility - to paraphrase: "oh, whoops! I didn't really look at the mural, now I wish that I had before typing out my comment, questioning what the problem with it was!"
It reminded me, at the time, of when Trump appeared (to all reasonable eyes) to have mocked Serge Kovaleski's disability - and I don't see Corbyn's supporters willingness to accept the excuse given as being any different from the cult-like manner in which Trump supporters will believe whatever he tell them to.
The excuse would have been very dubious if it were an isolated incident but that it was part of an already existing pattern of apparent antisemitism makes it even less plausible. If you can believe that is was simply bad luck that a man who could already reasonably be accused of antisemitism, based on a number of incidents over the years, accidentally defended an antisemetic mural (the only instance I've been able to find of Corbyn defending controversial art) because he didnt bother to look at it...well, then I think you'll believe anything.
As for some of those other instances:
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I find it hard to believe that an actual "anti-racist" would have wrote a glowing foreword, like the one Corbyn did to Hobson's Imperialism without at least critically referencing the antisemitism in it.
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His 2013 comments about "English irony" - I do think its plausible that he was referencing specific British Zionists, rather than all British Zionists, but it is certainly open to interpretation and, either way, was racist and othering.
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While much has been made of his calling representatives of Hamas and Hezbollah "friends", I'd be entirely prepared to accept that it was inclusive language, geared towards peace. What I found far less acceptable was his description of Hamas as being an organization dedicated to "bringing about long-term peace and social justice and political justice in the whole region". For context - at the time, Hamas's charter included the passage "The Day of Judgment will not come until Muslims fight the Jews and kill them…".
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His chairing and supporting of a conference that called for the eradication of Zionism from the Labour movement (a reminder - a Zionist is, broadly, someone who believes Israel should exist)
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His defence of prominent antisemitic conspiracy theorist, Raed Salah, who was (rightly) convicted of inciting antisemetic violence.
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Sharing a stage with a speaker who denounced Judaism and called the Jewish community "immoral in Justice". Now, of course, sharing a stage is not in and of itself an endorsement - but Corbyn didnt incidate any issue with the language used and, at the end of the speech, gave the speaker a big smile and a pat on the back.
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After the 2012 Sinai attack, where a group of Muslim extremists attacked an army base in Egypt, before entering Israel in stolen armored vehicles (dying in a firefight with the IDF), Corbyn went on Iranian state TV and put foward a baseless conspiracy theory that Israel was behind the attack.
There are other instances that draw criticism - and I don't think all of them are valid (particularly in isolation) but I don't think that a reasonable person who takes the time to actually examine the allegations is going to come to any conclusion other than that Jeremy Corbyn is antisemetic, and has demonstrated it on a number of occasions.
Personally, I did not want to believe him antisemetic and, were there perhaps 1 or 2 dubious incidents, or if all instances could be explained by a commitment to bringing about peace, I would have given him the benefit of the doubt.
Sadly, I do not believe such doubt exists.
And, to highlight, I have not even touched upon his handling and reaction to the antisemitism controversy as party leader.