I'm the same way with pianists who pick their noses and then go and put their fingers right on the keyboard. Nasty.
I think I've mentioned before that I once saw organist Don Patterson play a longish solo with his tongue, in a convincing imitation of cunnilingus. That was also the first time I hear Von Freeman play. Quite an afternoon.
That might be a reason Von declined a session with an organ late in life.