Emma was angry, she used the wrong words in the heat of battle. I am 100% sure what she meant was "stop acting like a gangster", fair enough it came out wrong, but to label her a racist because of it is just plain stupid.
These days all you have to do is dislike someone who isn't white, and your accused of being a racist. I don't like Victor, I hate his fake gangster act, I hate his slyness, I hate his whole attitude, and especially hate his violent temper. The fact that he is black, is irrelevant to me, I'd hate him if he was white, blue, green, or purple..