I feel like it would be even funnier if Bruce didn’t actively know Shazam was a kid, but its just his dad instinct goes off whenever Shazam is around and even Bruce is kind of weirded out by it.
Batman: You need to be more careful out there Shazam, your look before you leap attitude is going to get someone hurt.
Shazam *Visibly pouting and looking glum* yes sir.
Batman: *Sigh* I can’t stay mad at you. Look, how about you hit the showers,, then we get some pizza for the watchtower. My treat. We can discuss strategy then.
Shazam: Sure thing Batman! Thanks. *flies off*
Green Lantern: Okay Bruce? The fuck is going on with you and that guy?
Batman: I DON’T. KNOW. Its like every time I see him I find myself planning a college fund for the guy.
Green Lantern: He’s like in his thirties right?
Batman: I think so? I mean I don’t really know anything about him outside of work. I think I may need to do some digging here Hal because this is starting to freak me out.