Anti-Semitic?

I almost linked to this cartoon yesterday, because I approved of the over-the-top tone:

Anyway, I guess Harper's is now doing a sort of letters to the editor feature for their web-only content, and the third comment in this "Replies" post calls the cartoon anti-Semitic. I don't see it, but I did have trouble figuring out exactly what Mr. Fish was trying to say, so who knows.