An extremely complicated and often confusing term, as it can be used quite legitimately in political discussion. Zionism is simply the belief of the Jewish people in their right to exist, free from persecution, in their own country. Those claiming to be only anti-Zionist, not antisemitic are denying Israel’s right to exist, which is considered to be one of the manifestations of antisemitism. Criticism of specific policies of the Israeli government is not antisemitic.
‘Zionist’ is increasingly being used as a way of avoiding saying Jew. People who do this will usually exhibit other forms of antisemitic behaviour. The use of modifications, such as Zio, ZioTroll, and especially ZioNazi is always clearly antisemitic in intent.