feck me, are we really at the part where everyone's racist, so it's alright if Labour are too?
As a party, Labour are supposed to be committed to social justice and equality. That's a fair, decent goal, and I'd argue a lot of Corbyn's policies come close to helping achieve that, certainly much more so than his Tory or Lib Dem counterparts. But naturally if you're going to strive towards that goal then you're going to have higher standards for conduct than your right-wing counterparts: you're inevitably going to see inequality and discrimination as an evil that needs to be rooted out of society to the greatest extent possible, and a party that doesn't look to do this should not be one that appeals to someone on the left.
Look, I'll agree this discussion has to an extent been consistently overblown. Labour's problems with anti-semitism probably aren't as bad as the Tories' problems with anti-Muslim sentiment, and Boris will probably end up being their leader in spite of an array of offensive and derogatory comment he's made throughout his career on an almost impressively wide range of issues.
But something being overblown doesn't mean it's not a problem: what's fascinating is the mental gymnastics on display here from both general posters online (like here) and the party leadership to determine that it's not a problem at all. Or that every time it rears its head it's just an accident. The MP for Peterborough may not be a genuine anti-semite - but what does it say about her if she associates in circles where it's rampant to the point where it's easy for her to accidentally like a post containing it?