Even taking action against Israel or in favour of the Palestinian cause is not automatically hateful towards all Jews and therefore not necessarily a form of antisemitism. In theory, it should be possible to disagree about everything that has to do with the State of Israel. Among Jews, too, opinion is often divided.
But it is increasingly difficult to have a proper discussion about 'Zionism' or a normal, critical debate about Israel. Positions have hardened. Emotions run high. Look around on the internet or on social media: Israel is frequently compared to Nazi Germany. You will read things like: what Israel is doing to the Palestinians now is the same as the systematic extermination of Jews by the Nazis during the Second World War.