From observations things like asthma or other immune issues eg diabetes, thyroid, ms etc would mean you suffer more.
My husband simply doesn't suffer from as many coughs as me or my son as his air ways and lung capacity are/ is bigger and he certainly clears them more quickly.
Ive also noticed that with small children, I simply had to keep going (so developed pneumonia twice) whereas he appears to just go to bed... some how.
I suspect it's probably a joke.