Dozens of angry ralliers braved heavy rains outside the Brooklyn Museum Wednesday to protest antisemitism in public schools — which they claim Chancellor David Banks has “done nothing” to prevent. About 35 protesters bearing large Israel flags and “Educate Against Hate” signs showed up for the “Hey Chancellor Banks: What about Brooklyn” rally, an organized call for the city Department of Education to follow through on its promise to eradicate antisemitism from its schools. The protest was announced just days after The Post published an exclusive story on rampant antisemitism at a Brooklyn high school whose students have allegedly tormented...