I was taught that hearing interpreters owe the deaf community for our education in ASL. It doesn't matter whether our teachers were deaf or hearing, because somewhere along the line, ASL was passed along to our teachers who taught us. (Of course it's a sorry interpreter who never learned any ASL from a deaf person!)
As such, it is part of our ethical responsibility to donate our time back to the community. I've done things like working at Deaf Expo or volunteer interpreting.
So there's that aspect of it, that we don't turn our backs on the community once we are out there and earning money (I won't say "a living" because I never did) as interpreters.
To me this is the same situation and this interpreter is turning his back on the "community" (probably not ONLY this guy but obviously he was very important to this person becoming an interpreter) by distancing himself like that.
My teacher told a story about seeing a deaf friend at a party. A week or two earlier, she had interpreted for this friend, in a totally professional context, at a doctor's appointment. When she approached her friend at the party, she said "I haven't seen you in so long! What's been going on?" I thought it was a great example of how professional interpreters can have friends as clients and keep the two realms separate while maintaining confidentiality.
One of the comments on that video struck me, about how this friend possibly doesn't understand the Code of Ethics or doesn't know how to apply it to what CAN be an ethically sticky situation of having a friend for a client. Some people do go overboard in the interest of maintaining professionalism, and that can be excused. But I don't think it takes a great deal of intelligence or sensitivity to realize that turning one's back on a friend like that, especially one who had such an impact on one's interpreter education, is really uncalled for.
I hope the interpreter discusses this with more seasoned colleagues and realizes that he made an error in "reassigning" his friend in that way.