Amol Sinha vividly remembers the first time he felt targeted for his race, because it was on an elementary school field trip. A classmate, he recalled, “pushed me to the ground, punched me in the face, spit in my face and called me the N-word.” Sinha, the son of Indian immigrants and now the head of the New Jersey chapter of the ACLU, said he was left traumatized — and confused. “Clearly, this child did not know the meaning of the word he said,” Sinha said during a summit Tuesday on hate crimes and bias incidents at the Rutgers University Newark campus. “Clearly, he had learned hate at some po…