All through Asia, Latin America — almost everywhere — no public bathroom that is prone to receiving out of country guests would be complete without a sign telling users not to put toilet paper in the toilet.
Now, apparently, the plumbing-rich West needs signs telling out of country guests that it is, in fact, okay to flush their toilet paper.
With the rapid rise of international Chinese tourists — which has taken on movement proportions — I can imagine there may be a vitalized sense of confusion on this point.
Such a simple cultural practice can have dire results if practiced out of context. I can only imagine all of the mortified hotel housekeepers that travelers on both sides of the toilet paper divide have left behind.