The worst thing about this thread is the title.
First of all, it is awful grammar to write "antisemitic".
The word "Semitic" is a proper noun and has to be capitalized.
So if you want to throw a prefix in front, you need to use a hyphen.
That would make it "anti-Semitic".
But the word Semitic actually means "of an Arab language group", of which Hebrew is just one small example.
It comes from the word Shem, a son of Noah, who is claimed to be the father of all Arabs, including the Hebrew.
So calling an Arab anti-Semitic, is ridiculous, and that would mean he was anti-Arab.