Well firstly, you as a reader did actually know the context. That's why you could tell everyone else.

Secondly, giving that context requires the writer to know that it's not normal. If it's not normal. Yet you've failed to give that context. Your comment could just as easily be linked to in a forum mainly used by Hong Kongers or Singaporeans. Obviously, you have no reason to accommodate them because you shouldn't expect them to be your audience.