I'm not sure he even "accidentally" liked anti-Semitic tweets, did he? He entirely failed to address the problem of anti-Semitism in Labour, and I'm sure there are plenty of examples of him actually addressing e.g. anti-Black racism, but it's very different from Rowling and transphobia. (I feel a bit bad for criticising what was generally an interesting and thought-provoking book on this, but it is a hole in the argument that you could drive a bus through and it did have the effect of making me stop and re-examine how I'd responded to some of Baddiel's other points, which is not really doing himself any favours.)