I remember reading that little arc, it was one of those moments I felt>Yeah this is taking Joker too far
Not just because of the gun shot but there was some nonsense early on where while investigating the case of a murder Batman turns on the shower and the steam reveals Joker scrawls confessions of his psychosis or something. I just had to put the comic down for a minute with the thoughts going through my head.
Don't get me wrong TKJ and a bunch of other stuff have already commented that he is a weird asshole but it just felt like they were turning him into Buffalo Bill or something. I don't want to imagine a pale, skinny, green haired, wet, naked homicidal maniac finger painting his journal in the shower.
A character can inherently be a lot of things, implied or direct, from audience to audience through interpretation but generally the idea of a character is that there's something you want to convey and somethings you just don't convey.
It was that initial red light followed by how the rest of the arc unravels with him being 5 steps ahead of Bruce and Zatanna, somehow, and also tricking them in front of their face and all that crap instead of just being a crazy, clown themed guy they find and beat up.
Sometimes somehow it becomes too much. I can't even remember what my point was. Fuck Horror Movie Joker? Something like that.