Antisemitism is a word that was coined in the 19th century specifically as anti-Jew.
The fact that Semite today can now refer to non-Jews doesn't mean Antisemitism refers to non-Jews as well.
But anyway that wasn't my actual point anyway and you picked this over the main point. It is still valid, and you are free to pick a name specifically for it. Antiarab, antipalestanian or whatever you want.