So, was the "nose-cone' cracked and replaced or did the flight depart on turnround.
Just as you were in no position to accurately determine the serviceability of the nose cone, neither was the passing flight crew member. It would obviously need to be refered to engineering for such a determination to be made. A closer inspection from other than the terminal would also be most appropriate.
Just because you perceive to be "paying our wages" confers no right what so ever to be so rude and offensive. Nowhere in my job description does it say I am to accept personal abuse or rebuff from anybody.
