Until World War II, anti-Zionism was widespread among Jews for varying reasons. Orthodox Jews opposed Zionism on religious grounds, as preempting the Messiah, while many secular Jewish anti-Zionists identified more with ideals of the Enlightenment and saw Zionism as a reactionary ideology.

First, he was wrong for saying that. Second, he apologized. Was it because he was caught. No idea, good chance of that but 🤷.

More importantly, Zionist =/= Jews. There are plenty of Jews that are anti-Zionist. Some well known Jews including Noam Chomsky who has used the phrase "Judeo-Nazi tendencies" of the Israeli state. There is nothing wrong with being anti-Zionist.