Blah blah blah Batman on truth serum blablanla they take advantage of the situation to find out what the mysterious Bat actually thinks of them
Turns out he's the most neutral guy on the team. Someone will ask "But don't you hate Green Lantern?" Cuz the dude keeps trying to ragebait him but the dude just shrugs and goes "Eh. He's alright. Does his job decent enough." Gets asked "Is Clark the person you like to work with the most?" And all they get is "His skills are useful, much like everyone else's." (They asked "work with" not fuck—if he got asked that, it'd be a very different answer)
When asked why he's so damn lukewarm, Batman just says "We hang out sometimes, save the world most of the time, there are billions of people on earth I can't expect every single one to be just like me." Turns out he's just the most chill and open-minded dude and doesn't really take any of the offensive shit to heart cuz like, hello? He's got kids to raise and a city to save 24/7—who the hell has time for all that drama?
When one of the Batkids (Tim) asks who his favourite is, he says "depends on who's not actively trying to kill themselves at the moment." Then when asked who his least favourite is he says no one and then goes on a 20 minute tangent about how much he loves them, how much he adores them—it gets sappy and embarrassing real fast. He'd have gone on for much longer if the kids didn't beg him to stop talking.
Then when he's asked who he hates the most in general, the chill attitude drops real fast and he starts genuinely tweaking out about how much he fucking hates Lex Luthor—but not for the reasons they think.
Instead they learn that when they were 5 Lex, the little shit that he is, fucking pushed his head into his cake on his birthday and Bruce never forgot about it. Oliver's laughing his ass off cuz he specifically remembers this exact incident and at one point his 5-year old ass fell off his chair laughing.
Now Dick understands why during galas Lex would stay as far away as he could when Bruce is attending because whenever there's a cake nearby, Bruce would give him that look.