@serge It's even more important for goyische, specifically white Christian, leaders and mainstream to make this kind of thing unacceptable and embarrassing, since white Christians will respond to being shunned by their peers where they won't care about hurting Jewish people.
There are unfortunately a couple of barriers to making this happen, first in the segmentation of Christianity which means the Christians that are likely to listen to Jewish people and condemn this are also unlikely to be listened to by the out-and-out antisemitic right-wingers.
Second is that Christianity as an institution has had a structural and historical problem with antisemitism and appropriation practically since its inception, baked into its scriptures. Different churches have come to terms with this to different degrees, and European and Euro-settler churches have made practically no strides because European civilization itself, not coincidentally, rests on antisemitism.
So I can see why @ghostdancer is skeptical--but then again the needle has moved on these things before and I think it's worth trying. More importantly, Christians are the ones who need to listen and make that change.