Coffee orders though!
Batman as Bruce Wayne flirts with the waitress and gets the fanciest, fussiest, most complicated coffee drink imaginable. (Half-caf? Shot of butterscotch? The anti-Batman of coffee orders. FOOLPROOF DISGUISE).
Superman as Clark Kent wants juice. Bless his heart. And pancakes. Or waffles, Whatever’s easiest for the waitress! (He inhabits both identities more than he has a secret one. It’s not the same sort of subterfuge as Bruce. He’s just as much a farm boy from Kansas as he is Kal-El of Krypton).
Diana gets coffee, black. Coffee equivalent of a shot of whiskey. (STFU with your fancy subterfuge and secret identities, she has no heart for that).
Like if you don’t understand how awesome and adorable these coffee orders are, I don’t think I could ever explain it to you.