Please help me to settle a light-hearted family dispute!
Person A maintains that if you have a cold that's bad but not so bad you are marooned in bed, you just soldier on and ignore it. You turn up to whatever you have scheduled without telling anyone you are ill. They argue that germs are everywhere, and you can catch a cold at any time, from any one.
Person B says that if you have a cold you should ring those you're due to spend time with and tell them, giving them them option to go ahead, cancel, or reschedule. Person B's argument is that people then have a choice about whether to risk catching it - and can take a judgement in accordance with their personal circumstances which you might not always know (e.g. a big event coming up - party or wedding, or an immunosuppressed person in the family).