It's a bluff!
What, some First Officer is going to set his own policy with regard to whom he will or won't fly with? That should go down well with the Human Resources Department of his airline!
Does this fellow have any other personal needs his airline is happy to meet? A special diet or perhaps a roster consisting of mid-morning starts, no night-stops and weekends off? A special deal with the Rolex factory that gets him a third off on a GMT Master!
Where can I sign up? I will fly with anyone, even a jerk like this one, I can live on a diet of peanuts if someone else can just get the little bags open for me, I don't mind night-stops or working weekends and I even have my own Rolex.
The only thing is, I do need a set of clips for my Zimmer frame, there on the cockpit wall.