Usually, Iran is careful to keep blatant antisemitic attitudes under wraps. But sometimes the facade cracks.
A lengthy article in the official Iranian Mehr News describes how the Saudi royal family is supposedly really Jewish.
The convoluted story says that the Saudi family is all from the Jewish Bani Al-Qinaqa tribe, who were naturally immoral, that the Sauds destroyed Muslim holy places but preserved Jewish sites in Khaybar, and that today the Saudis are pro-Israel and anti-Muslim.
While the conspiracy theory of one's enemies really being Jewish is a well known trope in the Arab world (both Egyptian president Sisi's allies and the Muslim Brotherhood accuse each other of being Jewish,) we see that the Iranians also consider being Jewish as the ultimate insult.
After all, if Iran treasured Jews as much as they claim, then why should the Saudis' alleged Jewish roots matter one bit?