You don't know what "manic" means.
You should look it up.
I told you, I have literally seen people like Joker in real life.
It is BIZARRE to be dressed like a clown and not act clowning, I mean come on! It's part of his identity. Batman is a Bat-Ninja and he acts like it. He's does a voice and everything. Meanwhile, Joker, in full clown makeup and purple suit acts like some rational gangster.
It was terrible.
If his face was chemically disfigured and he was forced to look like a clown, but didn't act like it, okay. But, this guy DRESSES LIKE A CLOWN but acts like a clever gangster/psychopath.
It was a good movie, but terrible writing for this character.
They got very messed up by the whole "realism" in these movies. The Batmobile turns its light out on the highway and cops in a helicopter can't see it. That was super stupid and it's because they couldn't make a "science fiction" Batmobile because it's not real. Well, a car defeating a helicopter isn't real, at all!
Same with Joker. They thought he wasn't real enough and I have said he most certainly is. I mean the basic form of crazy criminal behavior.
Someone needs to make a real Batman movie! Iron Man is much like Batman and the character in the movie is a genius inventor, and so is Batman and he has advanced science fiction devices, just like Iron Man, and those movies were quite a big hit.
How was Joker not a manic? He fit the very meaning of the word!
And I listed a number of different ways that he acted like a clown.
And I don't see how behaving rationally means he's acting out of character either. Joker among other things is still a very intelligent character; he doesn't just always go off and spontaneously do shit without planning anything. TDK Joker was even partially based off the original Joker of the first couple issues
Mania is literally a mental health diagnosis and so look it up.