In a covers band I'll play songs I am ambivalent about, will play songs I don't like but refuse to play songs I hate - that crosses a line as far as I am concerned. Don't care if the rest of the band, the punters, the Queen or the Pope love it - if I hate it I won't play it. I play for fun, because I enjoy it, and for me it isn't fun to play a song I loathe with a passion. There are quite literally thousands of songs to choose from and it seems completely unreasonable for a band to try to pressurise a member into doing something they hate when there is so much choice. It is something I feel pretty strongly about, actually.