Is being a Zionist now a bad thing again?
It's a political ideology built on the idea of racial/ethnic superiority and divine rights to that group. Which lead to the genocide and theft of land of innocent Palestinians, who ironically were closely related to the people of Judea than any of the Europeans who stole the land.
But essentially if you believe a specific race of people are superior, even if it's under a religious context: That's wrong.