New York (CNN) — Before college, Fouad Abu-Hijleh, 25, did not know of a world where it was wrong to support Palestinians. Abu-Hijleh is the descendant of refugees from the 1948 Arab-Israeli War, when after Israel was created roughly 700,000 Palestinians fled or were expelled from their homes by armed Jewish groups in what Palestinians have since called al-Nakba or “the catastrophe.” His family eventually settled in neighboring Jordan, where he grew up with descendants of other Palestinian refugees. But at the University of North Carolina at Chapel Hill, Abu-Hijleh found his name on an anonymously run site dedicated to...