We have had "jetiquette" info for years. We even had videos showing situations--from pestering to drinking and boasting, seating, etc. They were rather comical but l think effective explaining do's and don'ts.
Seriously, those pax needed to be written up <period>. all they'll get is a slap on the wrist, but if they "didn't know" about exit rows--THEY WILL NOW. The FA should have stepped up. I've seen GAs go to the flight deck and saY there is an issue, jus to expedite. Doesn't take but one minute from the captain to set it all straight.