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Antisemitism is definitely a thing, a very bad thing with a very long history and lots of horrific things done to semitic peoples in many places over that long history. For sake of discussion, I will stipulate that it is a branch of racism/xenophobia.

Lots of ethnic groups/races in lots of countries have been victims of racism and xenophobia by lots of other groups in their own countries and in other countries.

Israel, as a country, has been very effective at weaponizing its "victim of racism/xenophobia." The ubitquity of the term "antisemitism" and the staunch defenders of the term are part of this weaponization. I have difficulty identifying other words that represent "a specific group that is a victim of racism/xenophobia" as well as antisemitism does.