Like for example, for me, having heard one of my Buddhist teachers say “fuck you” in a talk (actually, screamed), I was completely woken up, and I can tell you, I’m going to remember that day for a long time. It was like a Mahakala (wrathful deity) manifesting in front of us.
For some other people this very same act is a proof that his person is not a competent teacher. Or that he shouldn’t teach.
I think I really prefer my teachers to be human and have lots of humour about it, rather than the ones who try to present some “ideal”.

UPDATE: I was not clear, “other people” I’m referring to are part of a different sangha, that are using this piece of information to fuel their doubts about our lineage. People who were there at the talk, seemed to appreciate it a lot.