Saw Prof _____ ( the one that insulted me before). He was in front of the elevator. Looked at me and turn his look at the other way. I walked fast before the elevator's door open:

me: Assalamualaikum, Prof (smiling widely)
Him: (nodded)

It's okay prof. I still respect you. You are my lecturer. Even though you said I will never be you student.

:D