Actually I would go a bit further and say that I find it disrespectful not to follow along with what is being said and demonstrated by the crew. Surprising though it may be to some, but the safety demo is not for the crew's safety nor to pass the time; it is there for the passengers. How many times have I heard people chattering whilst the safety demo was taking place. I can understand it slightly when they are not English speakers. How often have I seen rows of newspapers n the old days . I am aware that some have the attention span of a cricket. This was why I found that those tedious safety demos with those Luvvies were far too long - particularly to non-British people who had not a clue who these people were. I even preferred the Turkish safety demo of the time with the Lego characters. I still have memories of those people taking the hand luggage with them when that aircraft caught fire at LAS. Whether this was panic mode behaviour or had these people not heard the instruction in the safety briefing that had been shown within the last 15 minutes; no one can be sure.