Snapped Shot has more about a Sapir College instructor who refused to see a student because she wore a Star of David. Keep in mind, the school is an Israeli college near Sderot, a city that suffers daily attacks from Islamic militants in nearby Gaza.
Wikipedia on the Star of David:
The Star of David or Shield of David is a generally recognized symbol of Jewish identity and Judaism. It is not a religious symbol.
It is named after King David of ancient Israel; and its earliest known communal usage began in the Middle Ages, alongside the more ancient symbol of the menorah. Geometrically it is the hexagram.
With the establishment of the State of Israel in 1948 the Star of David on the Flag of Israel has also become a symbol of Israel. The symbol is also associated with the Zionism movement.