Anti-Israel protesters vandalized a World War I memorial in Central Park on Monday and burned an American flag after a mob of more than 1,000 were blocked by cops from reaching the Metropolitan Museum of Art, where the star-studded Met Gala was in full swing. At least one America-hating vandal torched Old Glory at the site of the One Hundred Seventh Infantry Memorial statue, the base of which was defaced with graffiti reading “Gaza” in large black letters. Others plastered the statue’s bronze soldiers with stickers of the Palestinian flag reading “Stop the Genocide. End the apartheid. Free Palestine.” Some...