Again: I didn't say there aren't any cultures that show prejudices.
Exalted, as a setting and a game, doesn't support the idea that there is any meaningful difference between people. The people in the setting might, but the game is neutral about it, and the setting includes all kinds of groups that do all kinds of things. Women are just as capable and competent as men; often more capable (because of who they are as people, gen. Many of the world-changing Exalted personalities are gay or bisexual, and so on.
'There are some cultures that are patriarchal' does not change this. There are some that are matriarchal, and some that live like robots, too. The important point is that Exalted will never make it a suboptimal decision to play a woman, or a gay man, or a transgendered individual, or someone with a particular skin color. Mortal societies and their grievances are not a concern for the Exalted.
Exalted sets up characters to overcome (or enforce, I suppose, as they see fit) these kinds of disparities: they become the saviors or the controllers, but they are never the victims.