The men-women multiplier shouldn't be 10 (or 20, or whatever), so yes that is sexist. However, men's violence does seem to physically hurt people more often, and some studies suggest that young men are more prone to risky behavior than young women, so the existence of a multiplier itself isn't necessarily sexist. No similar statistical backing for a black-white multiplier exists.

I can't say I'm shocked to see a conservative argument that relies on ignoring the difference between 10 and 55. Innumerate sophist says what?