The gods weren't known for their small egos. Basically, if you wanted to avoid a twisted punishment from a Greek deity, you'd want to go with something like this: "Oh, I might be mildly talented, but I'm nowhere near as talented as you!"
In some versions of this myth, Actaeon dares to tell Artemis that he's just as good at hunting as she is. Oops. By saying he's better than a god, Actaeon is committing what is known as hubris to the Greeks—basically, it means you think you're better than a god. By the way, this never works out well for mortals.