I'll defend her. First of all the clip most people have seen was edited to remove some content that provided context. She was talking about terrorism in the United States, where more people are killed by right-wing extremists than other groups. Saying white men, was sloppy language, she should have said white supremacists or nationalists. This is the basic problem of prejudice, blaming an entire group because of their background, instead of individuals or elements of a group that are responsible. Eg, most white supremacists are responsible for violence not white men, and Islamic extremists are responsible for violence, not all Muslims, and so on.