For the record, I don't hate Tidus. I think he's a whiny and sheltered idiot, but it gives him a personality that's different from the standard. Most of his stupidity stems from the fact he knows all about Spira, and to compensate he tries to be upbeat and happy. He gets excited very easily, which makes him seem like a hyperactive child and ultimately grates on people. Most people hate him because of the laughing scene.

Further through the story he starts to gain true confidence in himself and surrounds. He's probably one of the better leads in the series to be honest.