This reminds me of that scene in The Simpsons:

Homer: I’m like that guy. That Spanish guy. You know, he fought the windmill…
Marge: Don Quixote?
Homer: No, that’s not it. What’s-his-name, the Man of La Mancha.
Marge: Don Quixote.
Homer: No!
Marge: I really think that was the character’s name. Don Quixote.
Homer: Fine! I’ll look it up! (Goes to look it up).
Marge: Well, who was it?
Homer: Nevermind.

Yup, pretty much. He wasn’t saying “Okay, you were right,” he was saying “Okay” angrily because he didn’t want to admit I was right! hehe.