At this point, the function of antisemitism in Western society is for Jews to be the "other." When a group needs something to pin, they'll come up with what they think is a well-reasoned, logical reason that that thing is bad, and Jews will end up symbolizing what is bad.

In left circles, the struggle is against imperialism and oppression, so Jews (Israelis) become uniquely bad imperialist colonizers and get run out of their spaces (Dyke Marches, activist groups, etc). In right circles, the struggle is against the global elite who's secretly leading the world, and so Jews conveniently control their money and media, and get run out of their spaces (not that there are many Jews in them, but we're not welcome regardless).