Have you googled what he has supported through his career, it's amazing and anyone with half a brain can see the propaganda of racism for what it is.
As far as I can see, he's relentlessly campaigned for peace, recognising that sometimes it's not as simple as governments are good and terrorists are bad. Have Hama's/Hezbollah/the IRA committed atrocities? Of course they have. Are they often a cover for organised crime? Of course they are.
But, only an idiot wouldn't recognise that all those groups were born out of genuine injustice and grievance.
The West carved up the Middle East without much consideration for those already living there. Consecutive Israeli governments illegally invaded and continues to seize land and assets that doesn't belong to it. Hell, if how they treat the Palestinians isn't bad enough, how about how that time they gave Ethiopian Jewish women birth control without telling them?
And the British government doesn't exactly have the best reputation in how it's treated the Irish, either (an attitude you can see echoes of in the current lot with their disregard of Ireland in regards to Brexit, such as the Tory MP who said that "the Irish really should know their place" - that was less than a year ago).
So yeah, Corbyn's chatted to a few dodgy characters, but he's consistently voted for anti-discrimination legislation, brought in early day motions condemning anti-Semitism, fought to prevent the demolition of a Jewish cemetery in his constituency in the 80s, campaigned for Yemeni Jews to be allowed to settle in the UK,and vocally condemns all racism... well, there's nowt there that screams 'racist' to me.
Unlike the Johnson, who says racist things, votes against equality legislation, and whose party is increasingly heading to the far right and the arms of the current US president, who's corrupt and also a massive racist.