sonoma, snake man,
About 6 months ago I had the pleasure to meet one of the crew controllers. This person told me that they don't like calling people on their days off, but they have to. WHen I asked if any notes were kept on refusals to fly on a day off, it was a clear NO! This person actually told me that the crewing people rather hear a 'No, I'm not interested' instead of the usual 'I just opened a beer' or whatever other lame excuse people come up with...
Personally I don't fly on days off (I do help them out when they ask me to do other flights instead of the one I'm doing, as long as it is on rostered working days), and I never had a bad experience with crewing.
So snake man, either your friend is telling you a heap of b*llsh1t, or he refused a legal change of duty (they CAN re-roster you in certain cases, e.g. change of equipment, training requirements,... )
MR8