If you want a female character for GTAV, you can play multiplayer.
I mean, I get why people want to play as female characters, and that is really fine if the story calls for it. For this regard there is Remember Me, Tomb Raider, Borderlands 2, Fallout series, Skyrim series, etc. Because in the story it fits.
However, this shouldn't mean that EVERY game developer should include a female protagonist in the story. A story is just that, a story about someone or some thing. If you can sex swap(Sex in the form of Man/Woman, not getting into Gender as that's a whole other subject) the main character, such as in Skyrim, Fallout, etc. And the story isn't affected that's fine. But if it's a game like GTAV, where the story will be king in it along with the gameplay, then developers shouldn't pander to the hot button in the industry.
In the end, it's not 'sexism' or anything. And nobody should be outraged about this or even be angry because it's somebody vision and story. If they wanted to put a playable female protag they could've, but if it doesn't call for it in the story then they shouldn't.