Well, here's the first example I saw. I can imagine that City Hall heard about it, without the info that made her look bad.
We were at his picture spot with the treasure, and there was a line. The family with him at the time involved a mom and a couple/few children. Jack was being flakey, but would have gotten back to the task at hand (signing books) soon...but the mom got angry about it, if memory serves she sort of shoved the autograph book back into his hands, and she did say something like "oh you WILL sign it" to him. He handed the book back, turned his back, and moved on to the next family. NEVER went back to them, though the mom stuck around for a few minutes.
It's something Mickey couldn't do and wouldn't do. But Jack is a pirate and he CAN. It's totally in character for him. He could, and he did.
I'm sure that wasn't the only instance of him doing things like that, b/c as I'm sure we all know there is no shortage of rude people at DLR, so they might very well have grown tired of fielding complaints about how Jack out of the blue, with no reason, just turned his back and ignored a family's dear sweet children for absolutely no reason.

(note: the kids were fine, and embarrassed if I recall correctly...I felt bad for
them)