Sorry for the mistake about Pfitzner. I may have been thinking of someone else whose name I can't recall now. It appears I was wrong about Hindemith too. I always assumed he was Jewish since he and his musoic were so despised by the Nazis and he was forced to emigrate. Apparently, however, he only had some Jewish family members (his wife, I think?), but wasn't actually Jewish himself.
And please, let's not start on the "Arabs are Semites too" nonsense. While Arabic and Hebrew are both classified by linguists as "Semitic" languages (as are Maltese, Akkadian, Aramaic, Amharic, and Phoenician, among others), the term "anti-semite" was coined in the late 1870s and has always been synonymous with anti-Judaism, not anti-Arabism (or anti-Akkadianism, Anti-Phoenicianism, etc.!). The German word "Antisemitismus" was first used by the German nationalist agitator William Marr in an 1879 book, the same year in which he founded the first "German League of Anti-Semites". Needless to say, Marr and his ilk used the term as a proud badge of honor to refer to themselves, and preferred the term Anti-Semite to Anti-Jewish because it was supposedly more "scientific" sounding (remember this was the era of "Social Dawinism" and the rise of all sorts of pseudo-scientifc racial theories. Phrenology anyone?). The term "Anti-Semite" is also often used in contradistinction to "Anti-Jewish" to distinguish those whose animus toward Jews is "race-based" from those who animus is religiously motivated. For the former, for example, a Jew is always a Jew, even if he converts, while for the latter, a Jew may "redeem" himself by converting. Thus the reason that converts were not spared the hatred of Nazi "racial" Anti-Semites.