The Presbyterian Church (PCUSA see comment below) has returned to the Christian ways of the past 2000 years: it has become a fount of Jew hate.
Jew hate has never had anything to do with Jews. Jews are merely the bogeyman, the scapegoats, in the internal Christian ideological battles.
I would guess there are no more than four Jews on the planet who care one iota about Presbyterian theology.
So it is not that Jews are picking on the innocent Presbyterians. The Presbyterian Jew hate position is totally self-motivated by the American Presbyterians.
The Presbyterian Church of America, in the past half-century, has seen its membership fall by half. This is because the Church is left-wing and activist and most of its members are not. In the past half-century the Presbyterian Church has been split by so called ‘confessions’ into groups that take the Bible literally and inerrant and those that don't.
In the past decade this has brought to a head the Presbyterian battle over the role of women in the clergy and gays in the clergy. The Church is eating itself to pieces over these issues.
The rise of Presbyterian Jew hate is entirely the byproduct of the internal dissension over women and gays. The Church is trying to focus its battle on the outside, against Jews. as a distraction from the internal battle that is destroying the Church.