Maybe he was offended by the Rick Astley pic you have on the inside of your locker?
(ok..., I'm not really sure why I said that..., it probably has something to do with me watching Saved by the Bell and BH 90210 when I was 15..., or it's because I only slept for 4 hours..., nobody told me a plummer came would come this morning to do some sucking (non-gay way) in the kitchen sink).