Yes Foxy... that behavior is not about manners. Your friend in this story was an extreme form of discourteous.
That being said... don't you think the "poor thing", an adult woman (old enough to drink) overreacted a bit?
If that happened to me, I would have ignored it unless I could have thought of a crass enough riposte. At most I would have given an obscene gesture and then forgotten about it. It certainly wouldn't have ruined my drink.
Maybe part of the problem is that people are too sensitive.