If only it worked like that.. Unfortunately the stigma is far greater on the first victim's side, the response would lightly graze the asshole's reputation
If she's considered to be of loose morals, people will believe the guy. If she's the teacher's pet and goes to Sunday services, she's getting the benefit of the doubt.
I spent 15 years working with high school boys. This is how it played out every time with few exceptions. We saw it multiple times per year. Society might evolve but the locker room moves a lot slower. We kept focusing on respecting each other, consent and keeping your yap shut when you've done something private with a consenting partner to respect privacy. Kids don't listen.
Best would be "he wanted to have sex but when he warned me about his micropenis I was uncomfortable with the girth, it was too big for my tiny vagina."
Billy Mays here! Is someone being a shitty person and spreading lies? Call now to be an even shittier person and perpetuate the lie with even disgusting and depraved lies! Now with 100% more scum for that real shitbag shine you always wanted! 1-800-U-R-A-DIRTY-LIAR
I don't think using someone's own insecurities against them because they were a jerk is quite the same as being truly hurtful to people who are actually going through mental distress.