A Jewish Columbia student was told to “kill yourself” and viciously kicked in the stomach by a keffiyeh-wearing pro-Palestinian protester for carrying an American flag. Elisha “Lishi” Baker, 21, of Boston, was also nearly burned on Monday while attending a pro-Palestinian rally in New York City after a protester lit the flag on fire, causing his shirt to catch flames. A police officer then ripped it out of his hands to protect him at the events, blocks from the World Trade Center. “I knew the anti-American sentiment was rampant [among protesters],” Baker told The Post Wednesday. “I didn’t know how...