I'm not comfortable flying at night, if we're flying together, is that OK with you?
A cute joke, but anything can be taken to an extreme. I have had first officers that felt uncomfortable with an operation and just needed to be educated.
Ace
While you posted tongue in cheek, yes, I would not fly with a pilot at night if he or she isn't comfortable. That's not as far fetched as it sounds. I've had First Officers assigned to me who were deficient enough in experience or skills that they were afraid of flying instruments, night cross country, and even talking on the radio. I found that rather unbelievable, but I've had it happen.
One of those individuals was very rough. It was more like a single pilot cockpit, but worse, because I ended up baby-sitting as much as anything. I began to get the impression that this was a very, very low time pilot who had probably falsified his experience and then bluffed his way into the position. One day he and I were talking, and approached by someone who wanted to know about learning to fly. During the course of the conversation, that individual asked us both about our experience and backgrounds.
I just about shot cocacola out my nose when the F/O told our visitor that he had six thousand hours.
That was fairly extreme, but yes, if another crewmember or passenger doesn't feel comfortable doing something, then we're not going to do it. I got employed as in a King Air 200 doing ambulance work. We often ended up at a metro airport, away from our rural base, and had to reposition at night. Some of the other pilots would hedgehop their way back at night, scud running as necessary. I evaluated the terrain, listened to all the advice, and decided that if I didn't feel comfortable and the weather wasn't at my comfort level, we would sit tight.
We spent the night a number of times in the FBO, waiting for low weather to lift so we could return home...where the field was surrounded by mountains on all sides and had no radar coverage and no approaches. I'd be happy to rent a car and drive the medical crew home if they liked, but the most conservative opinion always won...in this case it was me as PIC. On other occasions, I felt a trip was do-able, but the medical crew didn't like the turbulence, or some other factor. One hundred percent acceptable...the most conservative opinion wins.
Yours, too.