That brother is quite pitiful. He's afraid of the roller coaster, which is fine since it could be a real deal (breaker) for those with acrophobia, but more importantly he's afraid of a haunted house, like a little kid. Yet he still pretends to be so high and mighty than he insults Seo. Saying afterwards that he didn't mean it as an insult just makes it worse. It's like saying that if you are a man, you will just eat the insult and not make a big deal out of it, leaving you as the only insulted party, while the insulter is somehow mature.