Words mean what people think they mean. "Antisemitism" was evidently coined to mean any and all kinds of animosity against Jews as distinguished from Arabs or anyone else.

Historically. Arabs and Jews are both "Semites" in anthropological and especially linguistic terms. But that doesn't matter. As someone already pointed out, the literal etymology of a word has nothing to do with its ordinary common usage.

However, since the concept of "Semitism" in general is much more widely known in the West than it used to be, many people, Arabs especially, have begun to feel that the English word is misleading.
Since this is becoming an important, if perhaps erroneous perception, the suggestion that "Judeophobia" be brought into wider use in place of "antisemitism" is a useful one.

But since the entire complicated subject of Arabs, Palestinians, Jews, Israel, Palestine, religion, sociology, ethnicity, and race is politically and emotionally contentious, one can see that "Judeophobia" will in turn be rejected by persons claiming that "phobia" originally meant "fear," and "fear" is not necessarily the issue.

All you can do is say what you mean as pecisely as possible.