The term was coined as a word for hatred of Jewish people. There was no existing meaning to take away. If someone is racist against Arabs, call them racist against Arabs. Quibbling over definitions just comes off like you don’t have a better argument, especially when you’re wrong about the definitions. Being racist against Arabs isn’t bad because it’s antisemitic, it’s bad because racism is bad.
As I mentioned with homophobia, etymology is not the same as meaning.
No but in this case yes. You’re letting them take the meaning away from the word and in turn you’re justifying their discrimination of other Semites.
The term was coined as a word for hatred of Jewish people. There was no existing meaning to take away. If someone is racist against Arabs, call them racist against Arabs. Quibbling over definitions just comes off like you don’t have a better argument, especially when you’re wrong about the definitions. Being racist against Arabs isn’t bad because it’s antisemitic, it’s bad because racism is bad.