Regarding the term “anti-semitism”.

To begin with, there is no such thing as a semite. There is a family of languages, including Hebrew and Arabic (as well as ancient Ugaritic and Akkadian if I recall correctly) , that are referred to as “semitic”. Though Jews and Arabs happen to be blood/genetic relatives, that isn’t the general rule for all nationalities that speak semitic languages.

The term anti-semtism was, in fact, created by a Jew hater name Wilhelm Marr, a 19th century German politician. Marr founded a political party based on denying Jews civil rights but recognized the public relations problem caused by called the party “The Jew Hater’s Party”, so he coined the term “anti-semitism” to describe their ideology.

Until Arabs and their sympathizers started appropriating the term, anti-semitism exclusively meant an anti-Jewish attitude.