Sorry, that’s a silly argument. There are lots of words that have meanings that differ from those of their constituent parts. “Antisemitism” (note, not hyphenated) has a well established meaning of anti-Jewish racism. The debate is over what falls within that definition.

Do you consider Netanyahu to be a Semite?

Defining people based on Victorian racial categories does not interest me. “Antisemitism” is a term used since the late 19th century to refer to hatred of Jewish people, and Bibi Netanyahu is, sadly, Jewish.

Hatred of Bibi because he is a heinous individual is not, however, antisemitic by any of the definitions.