One response David L. Bernstein and I have received to our article on campus antisemitism and free speech is that we conflate antizionism with antisemitism. I think that is a misreading of our article; we discuss where University should do with regard to complaints about antisemitism without adjudicating whether the complaints are valid. We think that speech should be protected regardless of whether it is antisemitic, and disruptive, violent, harassing, and other illicit forms of protest should be punished regardless of whether it is antisemitic. So in most of the controversies that have arisen, the question of whether the speech or conduct is "really" antisemitic is not terribly relevant to our thesis.
However, the issue does arise when a student or professor is accused of illegal discrimination against Zionists. "Zionist" is an ideological position, and while university rules may prohibit ideological discrimination, and in some cases ideological discrimination at state universities may violate the First Amendment, Title VI does not prohibit discrimination against Zionists, as such.
Title VI does prohibit discrimination against Jews, and the question then arises as to whether discrimination that is claimed to be discrimination against Zionists can or should be deemed to be discrimination against Jews.