I tend to ignore her like I ignore most of the single-issue posters. She ignores us too: she never replies, so there's no discussion to be had. She just comes in, drops her ****, and leaves...
To ignore such creatures is surely the way to go. The Internet is a wide open arena where a motley collection of social misfits congregates to drop their load. These chowderheads, who hate Blacks, Jews, Latino, Asians, Muslims, Gays, people who look differently, are out there and they will wound another emotionally if allowed to as that is their aim. The key, as you suggest, is: Do not feed this human garbage.