The "other" genocides that Zionists like to bring up, either happened centuries ago (when there was no international law and Human Rights Declaration) or are fake (like accusation of Russia or China) or are done by countries that have never claimed to be a Beacon Of Light, Light Unto Nations and The Only Democracy In The Middle East.
Nobody who opposes Israel, cares if these people claim to be Jews. Nobody speaks about "Jews" doing it. (Except Zionists who claim that their atrocities and crimes against humanity is what real Jews should be like). To condemn Zionism and Zionist Nazism has nothing to do with Jews, as Jews also join condemning fascism in Palestine.
It is also quite ridiculous of Zionists, to say that all other genocides must be condemned before people get any right to point out to Zionism. It is like saying that if a serial rapist claims to be Jewish, one cannot apprehend and prosecute him before all other serial rapists are caught and prosecuted, otherwise it is antisemitic.