You don't seem like you want to say anything specific, but it would very much help!
It was a pretty freakin' misogynist and xenophobic movie.
I don't see how movies can be judged by such claims, is Lord of the Rings also misogynist and xenophobic? Should we ban and protest against all movies that portray problems relevant in modern society?
300 was an action movie with a faint historical theme about 300 men with huge swelling chests killing huge droves of enemies in fantastical environments, people put way too much time into analyzing movies about details that are merely background.
It wasn't just the ridiculous depictions of Xerxes and the Persians as subhuman brown-skinned freaks led by a giant androgyne . Remember that the other Greek tribes (especially the Athenians) were derided with jokes that they were gay (which is doubly egregious given that the Spartans have far more homosexuality ascribed to them in contemporary texts than the Athenians). The traitor Ephialtes was a cripple, mocked by Leonidas. In the end, the core values of the film (and graphic novel) are that the heroes are all big, manly men with giant pecs who disdain everyone and everything but themselves, and diplomacy is for pussies.
There's also the context that the creator himself offered in radio interviews that this was representative of the Huntington-esque Clash of Civilizations with the "civilized" world (represented by big, burly, manly Spartans) against the "uncivilized" Middle East (repesented by the otherwordly, subhuman Persians). Just before
300's premiere, Frank Miller stated the following on a radio interview with NPR (I remember actually listening to it at the time):
"For some reason, nobody seems to be talking about who we're up against, and the sixth century barbarism that they actually represent. These people saw people's heads off. They enslave women, they genitally mutilate their daughters, they do not behave by any cultural norms that are sensible to us. I'm speaking into a microphone that never could have been a product of their culture, and I'm living in a city where three thousand of my neighbors were killed by thieves of airplanes they never could have built."
So yeah. I think it's a fair cop to analyze what Miller is trying to say in
300.