I've given interviewers a piece of my mind before. Frankly, most interviewing practices, even at places which allegedly are highly selective, boil down to 100% cargo-culting, and when I encounter that I have no issue with telling the interviewer that and hanging up or walking out. At that point in the interview I'm not there to validate their approach or make sure they feel good; I'm there to communicate to them what I know, and what I know -- from experience -- is how useless most of the common interview processes are.