It's rude to shush people.
Nate was watching a movie in a theater, and the couple behind him kept talking.
Nate has to decide whether to say anything to the couple.
Nate lets the couple talk and just decides to ignores them.
Nate turns around and shushes the couple without saying anything.
The couple gets to enjoy the movie without anyone bothering them.
The couple feels disrespected and think that Nate must be a jerk.