I think some of the comments have been a bit much:

"Don't give us 'cant afford to' line, it sucks." Sorry but it is entirely possible to be in a position where one can't afford to sacrifice a night's pay.

"Jed Moron?" Was that necessary??

"Ego dictates and sense fails" So he's doing the gig purely for an ego trip? Oh and he's 'selfish' to boot?

I can well understand how someone who works a job where they don't get sick pay(like a musician) would not be able to afford to cancel a gig. I've been in that situation myself. It is not always possible to reschedule a cancelled gig, and I think we can be sure that Jed would be professional enough to take steps to minimize the impact of a cold on his performance. For starters he's already said that he can arrange it so he won't be close enough to the audience to infect anybody. The vocal mic and settings can be adjusted so that less singing volume is necessary, thereby minimizing damage to his voice, and he can select songs that are well within his range and don't require a lot of stretching vocally. There are over the counter meds that will minimize congestion, etc. plus the nip of adrenaline that often kicks in during a performance makes a difference. Also he can emphazise the instrumental aspect of the performance to further spare his voice. I think we can safely assume that he will do all these things and the audience will probably never be aware that he is under the weather.

I just don't think the personal insults were necessary or appropriate. There are other ways to express an opinion or get a point across.

Good luck with your gig Jed!