According to some reports, the cabin announcement triggered vigorous expression of complaints from certain passengers which sadly deteriorated into an altercation where a cabin crew member suffered injury.
Doubtless the legal meter will be running as the court determines where the line lies between disputatious behavior and interfering with the crew's performance of their duties.
Flying Lawyer, my interest in the cabin announcement is that it might add legitimacy to the passengers' sense of grievance -- perhaps more in the public mind than in court as you have pointed out.