What is antisemitism?
Arabs and palestinians are semitic people whereas 97% of Jews are not semitic. Most Jews are mongol-turkic (Ashkenazi) while the Mizrahi come from Spainish, Moroccan, Persian, and other admixtures. Most of the semitic Hebrews originally in Palestine were killed by Hadrian's legions in a bloody war.
People killing Palestinians and Arabs are antisemitic. Those who defend and support those killers are also antisemitic. Therefore Jews and their supporters are antisemitic.