Lord of the memes

He's a... method actor. He's one of those guys who will literally live in the role until production is finished, on and off camera.

He got a lot of hate for playing Joker in Suicide Squad (the first one), not only because their version of Joker was a cringey edge lord instead of the brilliant psychopath he's usually portrayed as, but also because, while he was "in character," he did a bunch of awful things to his costars, including mailing them used condoms. All because his character would've done those things and he was trying to live out the role in real life.

Then he acted in Morbius and was again awful to deal with until filming was wrapped, and it sparked a whole debate over whether method actors were even good actors in the first place.

I mean, as far as I'm concerned, if you can't seamlessly slip into a role when the cameras turn on, then you're kind of a shitty actor. If you need to adopt the role and be that character for the entire production timeline, then you kind of suck at acting. But that's just my opinion.