The Huthis and their anti-Jewishness

I have not been able to understand the anti-Jewish component of the Huthi ideology.  It comes out of nowhere.  What the movement did to the Jews of Sa`dah (who never bothered the Huthis) was quite cruel and totally unjustified.  I just read the book by Ahmad Muhammad Ad-Daghshi on the Huthis (الحوثيّون: دراسة منهجيّة شاملة) and I still don't get it.  Husayn Huthi blames all problems on Jews, reminiscent of European anti-Semitism.  In fact, the ideology of the movement complain about the Sunni educational systems because Jews are not treated like pagans.