I'm shocked. Not shocked that Hal hit Batman. I'm shocked at how many people ARE shocked that Hal hit Batman.
"Dude, nobody hits Batman, man."
Well, Dude, here's a news flash: getting hit is what Batman does. A lot.
Have you ever actually see someone punch, say, Aquaman (god help them)? Flash (how?) ? Even Booster Gold (who is 6 foot 5, ya know)? No.
Batman? Taking a wallop is Batman's superpower. Batman gets clobbered in about one of every three stories he's in. And if you stick with me, I'm going to start proving it, because nothing says,"I'm Batman!" like getting wallopped upside the cranium.