Mel Gibson, not nuts at all.

Just a tad highly strung.
From TMZ
"Gibson was speaking to a film class about his movies, and several members of the Mayan community came to hear the famous director.

After Gibson's presentation, the crowd was allowed to ask questions. Alicia Estrada, an Assistant Professor of Central American Studies at CSUN, challenged Gibson, asking him if he had read about the Mayan culture before shooting the controversial film. Gibson said he had. Estrada persisted, stating that representations in the movie that the Mayans engaged in sacrificial ceremonies and had bloodthirsty tendencies were both wrong and racist. Gibson then exploded in anger, responding, "Lady, F**k off." Gibson also became extremely angry when members of the Mayan community protested on how they were portrayed in the film. The emotional Mayan members were escorted out of the room, and we're told Gibson screamed a parting shot -- "Make your own movie!"

You know, Mel 'Suger Tits' Gibson amuses the hell out of me, but outbursts notwithstanding, he's probably right this time. It's a film, and films are not always known for being steeped in exact historical fact. I doubt the Spartans were really running around in little leather shorties, but damn it was good to see on screen. People need to stop apologising over shit all the time.
Make your own fucking movie indeed.