Having flown multiple flights both FC and premium seats where free drinks are served i am yet to witness what you've described. I'm sure you saw this happen but am pretty sure it was an isolated incident and not the norm.
Scuba,
We have also flown many first class flights where the drinks are gratis and we have never seen this before either but trust me, once was more than enough!
If someone can't handle or isn't willing to be reasonable with their on board drinks, methinks it doesn't matter where they're seated. In this situation, the people had quite the bill at the end of their flight
In honesty, it's the only time I've ever seen anyone reach that extreme but watching the evening news lately leads me to believe it happens more frequently than we might realize.