"The signs are...antisemitic, repugnant, and a disgrace."
The signs the individuals in Washington Square Park are holding are antisemitic, repugnant, and a disgrace; they are, in a word, vile.
However, they are not NYU students. The NY Post has identified them not as NYU students, but as New York City high school students who traveled to Washington Square (a public park, not NYU's property) to participate in the protest. I believe the high school they attend or the NYC school system may have issued a statement about the matter acknowledging this.
To be clear, antisemitism violates the University's rules, and violators are subject to university conduct proceedings.
—NYU Spokesperson John Beckman