sharp: The Rebbe transgressed an issur d’oraysa! Judging people differently based on their background is something that is written straight out in the Torah!
I once wrote before about another Rebbe I had in that yeshiva who did a lot of wrong to me. I actually wrote a letter to him a few years ago about it, and he apologized. The Rebbe I mentioned in this thread, however, never gave me an apology.