I know it's hardly surprising that the origin of this quote comes from JLI. And I know I assumed it came from Batman. But there's something so satisfying in getting proof of this. I'd always thought that Bruce enjoyed the humor in JLI even if he sometimes got annoyed with it. If he could get caught up enough to tell jokes he must harbor some good feelings towards those people.
“I’ve always enjoyed your sense of humor, Booster.”
— The Batman in Justice League International #1