what middle button does

It's very common that people are annoyed about something because they thought they understood it, but in fact they didn't, and so now something has happened which they perceive as a disruption to the natural order of things, but in fact they just didn't understand in the first place.

Language Log provides a long stream of examples of people complaining of this or that "mistake" or "modernism" in English when in fact the supposed "error" can be traced back to impeccable English writers from centuries previous.

Most of the time it doesn't help, people go along believing that they're right and the whole world is wrong. But once in a while, just often enough to give hope, someone says "Oh, I see, how embarrassing" and learns a little bit more about the world.