Males aren't the only ones who are pissed at false allegations. As someone said above, they can ruin lives, ruin people emotionally and mentally. They also really piss off a lot of people that have been raped, not only because it makes people more skeptical-just see some people's postings on places like this- but because said false accusers have no idea how fucking lucky they are not to have actually gone through that trauma, and how much a victim wishes they hadn't.
It's a slap in the face for a rape victim, male or female, and a life ruining experience for the accused male and his family.