I like petty villains. Post moments where the villain went out of his/her way to be as pointlessly dickish as possible for no reason or a very tiny reason. I think the absolute crowner would have to be Luthor's behavior at the end of pic related.

>just defeated Brainiac, possibly the most dangerous being in the universe, and obtained near omnipotence
>has such incredible power that he can give eternal bliss to everyone and be known as literally god and the savior of all existence
>there's just one condition: he can't use his godly power to kill anyone
>decides he doesn't want to be a god anymore, throws a bitch fit, and dooms octillions of people who otherwise would've had eternal bliss to suffering and death, solely so he could be a dick to Superman