Zionist is not the same as being Christian, Muslim, Black etc A lot of Jewish people are anti zionist. Being anti zionist is not anti semetic. A zionist believes in the state of Israel as a homeland for all Jewish people. The same land that the Palestinians lived on before being turfed out and their homes given to people, including in the present day to young westerners. It's not a slur to say you wouldn't want a zionist on a trip, i personally wouldnt want to spend time with one so for once I agree with Janet.
But I'm guessing you are a zionist as youre super defensive and touché about Israel and Zionism so we'll have to disagree.