it doesnt even make sense because by definition both parties are semetic.

Oof, either you're just grossly misinformed and performing a cringey "ackchually", or you're anti-semitic yourself and perpetuating anti-semitic rhetoric.

While yes, both are Semitic people, the term 'anti-semitic' was specifically coined by Nazi Germany to make their genocide seem like it had a basis in science. They specifically used it to refer to Jews. Nobody uses "anti-semitic" to mean all semites except hate groups and holocaust deniers who are trying to say "see, it doesn't even mean Jews specifically! Jews are just playing the victim!"

I will assume you're simply ignorant or misinformed, but feel free to correct me if this was actually an intentional dog-whistle.