The comment about intoxicated performance does not really reflect differences in culture.
In my opinion, it only reflects the different phases of the karaoke acceptance in society.
Stage fright is normal for most people.
Standing in front of the audience and making a fool of yourself requires some courage or disguise.
What is a better disguise than being drunk?
A drunk can vent his exhibitionism and jokingly dismiss the embarassment afterwards.
Drunken singers in karaoke bar were how the fad started anywhere.
As more serious singers start to see they can really perform with confidence after a lot of behind the door practice at home, they will become the norm.
Though, it may be funny to watch someone humiliate himself in public, it becomes boring after a while.
Besides, as the audience, listening to out of tune singing is a torture similar to scratching the blackboard with finger nails.
Given a choice, the audience will prefer an entertainment over a torture.
The drunken singers will hold back when there are enough serious singers on stage.
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