Their point was that incentivising rape allegations as a means to permit an abortion will lead to a non-zero number of instances where false allegations will occur. This is correct. Men weren't being victimized, and comparing this guy with a rapist is immature and downright disrespectful to victims of rape.
If you are ok with a few more instances of men being falsely accused of rape for the greater good of women, then your thinking is analogous to the person in the original post who was ok with 1 person being raped to stop the killing of thousands of unborn babies.
Random question but I'm just wondering your position on this. Is the burden of proof on pro-choice or pro-life advocates when it comes to the humanity of a fetus? In other words, should abortion be legal until we can prove that a fetus is human or should it be illegal until we can prove it isn't? Just genuinely curious.