Anti-Zionist?
Anti-Semitic?
It's the same as saying anti-Germanic or whatever the fuck else. It's no different, but it's been scarred into everyone's heads that the absolute shittiest of shitty people are those who don't like Jewish people. No other ethnic group elicits such outrage upon people remotely disapproving of them. We don't feel sorry for all the other groups that have been massacred en masse over the years, but you mention Israel or Jewish people with a negative tone and someone around you will do their damndest to make you know that you shouldn't have said that.
I don't know what's so anti-Semitic about questioning the Zionist philosophy when it was obviously going to cause a LOT of problems. What prevented the Jewish population of Earth from, I don't know... not having their own country and just being like every other religion? Okay, we're gonna declare that a bunch of black people have to move out of a project in Harlem so that a white supremacist group could move in because that's where their family in this country first lived one or two hundred years ago.
Just debate it like any other issue, it'll be good for you.