A kosher Upper East Side cafe was subjected to a second antisemitic attack in four days — and the outraged owner is challenging the city to do something about it. Hummus Kitchen on Second Avenue was targeted Sunday night by an unhinged woman who tried to cover up an Israel/US flag, pushed an employee, and stormed off after giving staff the middle finger, according to police and disturbing videos shared on social media. The Sunday strike comes on the heels of a Dec. 13 incident in which a Paterson, NJ woman tried to tear down the restaurant’s flag in an...