I once played in a covers band who did loads of songs that I hated - mostly Eagles stuff. One rehearsal the keyboard player flatly refused to play 'Born to be Wild', which was a shame as it sounded better than half of the existing set. The rest of the band tried talking him round because, well, he had a music degree (and everything) and everyone thought the sun shone out of his arse.
I thought about explaining that the songs that he sang live were the ones that bombed as they were 'his favourites' but had never sat well in the set or gone down particularly well. In the end I figured that he had enough people massaging his ego and surmised "You're a cock. Be a cock. I'm off" and left.
That sounds harsh but it wasn't a one off and was the straw that broke the camel's back - I'm really a musical prostitute and will play owt for money!