Point is there're way more potential reasons for the hand off than either Batman saying "hey neat" or "I makez trident?"
Batman: What was I thinking, putting together a team of heroes....there's no way this was ever going to work. Not with amateurs like these.
Aquaman: Hey, fuck you, Mouth-breather.
Batman: No, Fuck YOU, Fish-breath
Aquaman: This is a waste of time. Imma ring Mera and-
Batman: What did you say?!
Aquaman: I said I'm leav-
Batman: You said Martha, didn't you?
Aquaman: What? No, I said Me-
Batman: I take it all back. People like us need to come together. Unite as one. Lend each other....a hand