Apaddy
Once again you miss the point.
Any professional in any wlka of life can easily avoid problems with punters, after all we have the expert knowledge and status to deal effortlessly with such feedback.
"Ah thanks for pointing that out sir, it looks okay at first glance, but we'll check it out to be on the safe side, thanks again for taking the time to raise your concern."
End of story, relieved passenger, airline reputation enhanced.
Any professional who lets this type of event escalate into even a raising of voices is an idiot.
You would have added undue stress to the start of that pilots day which would have lasted a lot longer then the event itself and could have created a its own sequence of events that could have led to safety being compromised, heaven knows we have seen enough cases of events where pilots where stressed by outside situations jeopordising their judgement!
Paddy, I realise that you are CC, not a pilot, but flight deck are responsible for their state of health and any pilot who believes s/he is not fit to fly must declare himself sick, so your point is invalid.