Of course you won't hear an anti-semitic joke - it isn't that kind of anti-semitism. The left also has a long history of associating Jews with capitalism. Turn up a stone on twitter and you'll find a Corbynista spouting Rothschild conspiracy sh1t. This isn't a new phenomenon. Orwell was pointing it out in the 30s. However, the need to pander to large Islamic communities in certain constituencies has undoubtedly made Labour more tolerant of it of late and given cover to the latent anti-semitism of longer-standing leftists.