Eight in ten British Jews consider themselves to be a Zionist. Only six percent do not.

Anti Zionism isn't antisemitism. Israel is a fascist state with no right to exist.

This is antisemitism on two counts.

1. The reason is because you are singling out the only Jewish state as being uniquely lacking legitimacy as a state, and therefore Jews as the only people on this planet who don't have the right of self-determination. Antizionism would be to call for the destruction of Israel, which is also antisemitic.
2. Comparing the only Jewish state to the very regime which murdered more than 6,000,000 Jews is an antisemitic comparison and designed to hurt Jews.