He clearly wrote "PAPER MARIO 1." In caps. He is technically correct, though he surely misinterpreted the post he's responding to.
There's no need for comments like that, PaperLuigi. It's great that you're trying to be helpful, but you only ruin that effort by being rude.
While this particular sub-forum is not heavily moderated, there are guidelines posted that should be followed. In the future, let's keep posts directly related to the parties buying and/or selling objects.