I commute between DUB and LHR before and after every duty so as a passenger as much as I am a crew member I see it all! I have seen fellow commuters (in uniform) chatting away or reading newspapers during the demo, I also have seen fellow commuters (in uniform) engaged in a conversation with fellow passengers actually make a point of stopping the conversation for the duration of the demo! So all in all its very relative to the individuals in question.
At the end of the day no airline controls its employees personalities and an interview is not a fail safe way of weeding those with the wrong personality out!