Whatever about that group,
since when can't Jews be antisemitic? @berbatrick has shown in this thread that Netanyahu and his son have spread antisemitic tropes. I've mentioned the case of Gilad Atzmon a couple of times, he's an Israeli Jew who now claims that he despises "the Jew" in him and engages in the most vulgar forms of antisemitism.
My father-in-law is an Arab and I've never encountered anyone, in real life or online, who hates Arabs more. No serious analysis of racism suggests that its targets are somehow uniquely free from its grasp. That group and the Holocaust survivor mentioned above may or may not be antisemites, or have spread antisemitic tropes, but their Jewish identity should not be the primary consideration when making that judgement.