This is one of those scenarios where of course airline people know how to do things. But you cannot expect the consumers of your service to have the same level of fluency. Does everyone on the entire aircraft acknowledge and believe that evacuating the aircraft in 90 seconds is the number one goal?

I would say no. Despite it being somewhat logical, I think it is unreasonable to believe that people are rational agents and won't act emotionally in a state of emergency.

So don't get upset that people aren't following your directions.