That was a different Joker

As the other comment says, different joker. Also, yeah a lot of its stupid and cringy. It all depends on the author and the context. As with all art though, it’s a tool for the author to send a message. Almost every hero and villain is a vessel for the author to talk through. They are making art and have something to say. You aren’t supposed to like the Joker, but he is supposed to carry a message still. That message is usually that our society is inhumane and flawed and treats people horribly.