"Photography is a foreign language..."

I found this outside of the art room at Blake High School in Minneapolis:

"Photography is a foreign language everyone thinks he speaks" -Philip-Lorca diCorcia

Is he saying people THINK they are good at photography (or think they can "understand" photography) when they really don't? Is this a bit of an elitist take on amateur photographers? Is he talking about the proliferation of cameras in our society over the last few decades? Without knowing where diCorcia places his emphasis in that quote, I can't get a solid grasp of what he's trying to say, but I'm still intrigued...