Not exclusively. One of the top comments I read was from someone who didn't care and didn't know what the storyline was and still called the game a racist piece of shit or something... I can understand when people react to comments like that (not... excessively of course, what is it with tumblr and death threats??), but for just feeling uncomfortable that irritated me too, I think people were mixing up two stances on the issue.
Or maybe people were just being douchebags about it I don't know.... I wouldn't give anyone shit for not playing say a zombie game if they're afraid of it I don't see why it should be different with other themes that can upset people.