Where to start with this one?
1. As KingOfRhye points out, Semitic refers to languages, including the island-dwelling Maltese and the valley-dwelling speakers of Amharic.
2. Antisemitism has as much to do with Semitic peoples as antipasti have to do with pasta. The word was invented in the nineteenth century by people who hated Jews as a “scientific” term for their own views. The very concept of someone who hates Jews, Arabs, Assyrians, Maltese, and the speakers of a range of languages spoken in Ethiopia such as Chaha and Soddo, yet has no animus toward Berbers, Kurds, Turks or the speakers of a range of languages spoken in Ethiopia such as Oromo and Mursi stretches credulity beyond breaking point. Linking antisemitism to Semitic peoples as a whole is simply absurd.
3. Trying to split Jews into “Hebrews” and “Zionists” is not only false, but attempts to deny the Jewishness of the vast majority of Jews who support the existence of Israel.
4. The Khazar legend, beloved of antisemites, at most affected a few hundred aristocrats whose distinctiveness was lost centuries ago. Still, it’s used as a way of denying the Jewishness of Jews.
5. The Rothschilds were important to the early development of Jewish settlement in Ottoman Palestine, but by no means can Zionism be described as a “Rothschilds scheme,” unless, of course, you’re an antisemite.