Yes, there is a massive doublethink in our culture about rapists; on the one hand, they are supposed to be these awful monsters and yet otoh you can go on FB and set up sites that are only half-ironic.
Some of the people posting on those sites are going to be rapists, aren't they? Almost certainly. And they are in a public site, supported by advertisers, used by employers, companies, individuals, boasting about how funny it is that they either rape women or think it would be OK to do so.
And in a country where we have a 1 in 4 chance of being raped or sexually assualted, with practically no chance whatsoever of our attackers being brought to justice for it, we are supposed to simper and smile and not be humourless feminists and find it OK that that FB page exists. And then people tell us that the rape culture is a hysterical invention of our own fevered imaginations.
Although I think it backfired to some extent because there are loads of feminists there posting on it now from waht I understand, getting real information out there.