CP3S said:

You back them up in as far as saying that the things you are disagreeing with are bullshit because they are bullshit, you just say it in as many words as possible.

Meta Humuour at its finest.

"Look at me. I'm accusing you of not backing up your claims, just stating them, or backing them up with themselves.
However, I'm not going to back up this accusation myself, just state it.

The meta joke being that I'm making myself guilty of something I'm attributing to you, while not proving you to be guilty of it as I'm not backing it up.
So basically, I'm accusing solely you by telling, while condemning solely myself by showing.

It's like in that movie, "Be Cool", where Steven Tyler, playing himself, claims he's not one of those musicians who go on to star in movies, while doing exactly this by playing this role. The character exonerates himself, but condemns the actor! And they're the same person! Now wasn't that hilarious?

Or that other one, where the killer hits the wrong target, and then asks: "Well whose fault is that?"
Vince Vaughn: "... It's your fault? Duh?"

Hehe, yea I know, I do have my moments, LOL!"

...

Oh wait, that wasn't intentional.