You do realize that if a representative of the FAA is on a flight and observes the FA not enforcing the rules the FA can be personally held responsible and the airline fined?

I don't see why it's so hard for people to just follow the rules and stop acting like they are more important than everyone else or that the rules should not apply to them simply because they are inconvenienced. Was the FA little heavy-handed...perhaps. But when you look at it from the FA's POV where most pax ignore safety instructions, blatantly ignore the rules and are referred to by customers as "a group of self-entitled servers with a perpetual inferiority complex" and have been subject to physical assault one begins to understand why they may feel the need to take a more aggressive posture.

You know, the easiest way to avoid this issue with the FA in the first place is to turn your *@%$ phone off. Unless someone is actively dying, whatever it is can wait.