I play the executive courses almost every day and my group does not T-off until the group in front begins to T-off. Problem solved with no backups but a slow group will slow down everyone else behind them. The ambassador should encourage the slow group to speed it up.

Be patient. Relax. It’s a game. Play a little “one tie all tie” Hither and Yon for quarters while you wait. I’d rather occupy myself on a tee box while the group in front of me takes a few practice putts than sit on a tee box and wait for a group to tee off.

Etiquette course for new golfers or some with bad memories should be "mandated" (just love that word, giggle, snort)

And so it is people...
 

with an attitude like this that are the issue. It's all about me and don't consider others or the fact that a game that is over 300 years old has always had etiquette that takes the other players into account. It is one of the things about golf that makes it unique and a pleasure to play.

Simplify the game and make it sound as if what a player does is okay because they don't care. How adult and mature.

Why not practice putting on the practice green? When playing with people with this attitude just completely ignore them. The ambassadors know some of the etiquette ...pass the issue on to them. If the party argues with them the asst. manager can easily ban them for improper behavior.