simple as that
When somebody makes an critical mistake when they're overcomplicating things that are clearly straigthforward, somebody will have to point the flaw in their argument. Most of the times this includes an simplification.
Person 1: Women have more STD than men. This means that men are sluts, because if the women were the sluts men should have equal or more STD .
Person 2: You can't conclude that. You don't know who has sex with whom. Men have less sex, less risk of STDs. Women have more sex, more likely to have STDs. Simple as that.