The article quotes Sartre: "Never believe that anti-Semites are completely unaware of the absurdity of their replies". Slavoj Žižek's point is better however: even if all the things anti-Semites say are true (Jews control the banks, the movies, whatever), the anti-Semitic fixation is still pathological: they need this fixation in order to assert their own identity [1].
[1] Žižek repeats this point across interviews, as he often does, most recently, https://www.youtube.com/watch?v=zrkVoPljJiM