Yes, Arabs are also Semites. However, antisemitism specifically refers to hatred of Jews. Not all Semites. Therefore Arabs can be antisemites. In fact, even Jews can be antisemites. What else would you call a Jewish youth who joins a white supremacist group?
Thousands protest outlawing of Islamic Movement in Umm al-Fahm in northern Israel (Haaretz)
from the article: Comparing Islamic anti-Semitism to Nazi Germany at its worst
A Palestinian teen who tried to stab an Israeli woman in the West Bank was run over and shot to death. Her father, imam of the refugee camp where she grew up, says his daughter was 'responding to the occupation.'04:30 28.11.15 | 1 comments