Three strikes and you’re out.
Isn’t it pretty easy to guess what Superman (or any hero) will say next? Perfect people can get pretty predictable. It’s not that Bizarro Superman is a unique villain. He’s opposite, arbitrary and INTERESTING!
Haven’t you ever spoken without thinking? Does your comment ever come out wrong? Has a listener taken something the wrong way?
Sure, it wasn’t fun at the time. But it makes a good story now, right?
Let your characters blurt. Humans sounding human. Try it.