Strictly from my personal opinion, I WANT to be questioned when I tell my WH that I've got a disqualifying foul. Here in Virginia, when a person disqualifies themselves from further participation in a game, they also have to sit at least the following game. Two games if it's for a fighting disqualification. Before I tell a player or coach that he's gone for that long, I want another person who's not involved in the heat of the incident to confirm that I'm making the right decision.
The version of this that I'm NOT a fan of, though, is when a player does something and the ejection's not enforced when it's clearly deserved. I was working BJ in a game last year in a blowout, and one of the wide receivers for the team getting crashed came up from a tackle with a two-handed shot to the face of the guy who tackled him. Blatant shot, no way it was any sort of "football action". The R (who I really respect as an official) signaled the foul, but then went to the coach and said "you can sit him the rest of the game, or we can eject him." If it was a borderline situation, I've got no problem with "saving the player" (as we call it around here), but not for a flagrant action like that. Kid's got to learn that losing his cool is going to cost him, IMHO.