I had something similar where my boss phoned me whilst I was properly ill and kept going on about how I could work off time spent out of work now by working extra unpaid shifts in the height of the season. I was too fucked to argue at the time. I just told him that, in case he hadn't already realised, I am not immortal and then coughed a lot. Now, I'm thinking there probably won't be a height of the season or even a job, so it's pointless worrying.