I think most of it is just confusion inherent in the term "antisemitism", which TBH is a bad term because it singles out a single Semitic people among many as the oppressed ones. That false focus then in turn causes a knee-jerk pendulum swing towards another extreme.
And who's to blame? Again, Germans: The term was introduced to replace "Judenhass" (jew hatred) with something "more scientific sounding", as recently as 1879. Damn that's a lot of citations there. Maybe we should switch to "Jewphobia" or something.