I think there are plenty of way to disturb the status quo that don't involve arguing that white people suck. Othering people isn't helpful.

There's a saying I like: you can be right, or you can have friends. Ms. Khan may be right on her historical facts, but acting like a jerk is unlikely to win many to your cause. I'm sure she doesn't care, fair enough. But my time, money, and sympathy go elsewhere.