First Awareness of Racism at Age 10

When did I first become aware of racism? First hint, in Germany, attending German schools, Xmas coming up. I was there as the son of a Fulbright Exchange professor, 1955. The teacher asked me if I was willing to play the black king in the Xmas play. I couldn't see any reason not to to, so I said yes. The rest of the class burst out in laughter and sighs of relief. Soon I would hear derisive cries of, "Du bist die Schwarzinger Koenig." "You are the black king." From then on I began to put two and two together.