Schedule or Schedule??

In the English class in CL today, we were discussing grammar rules and related stuff. So the teacher was trying to give an example for something, and she mentioned the word schedule in the sentence and said, "Shedule or Skedule, whichever you prefer."

So I raised my hand and asked her, to clear the confusion once and for all, "Ma'am what is the correct pronounciation? sHedule or sKedule?"

She replied, "See both are correct, but we normally use sKedule nowadays because sHedule is used for referring to scheduled castes and all."

I am still confused. Isn't that discrimination? Seperating a group of people not only on the basis of their origin or birth, but also by using a simple alteration in the pronounciation of a word of the english language!! Bizarre.....