When someone has a bad experience with the opposite gender and takes it out on the whole gender.
A character has had several bad experiences with the opposite gender and decides to take it out on the entire gender. In extreme cases, this can occur after only one bad experience. In more extreme cases, they may band together a whole vigilante group. In even more extreme cases, this may lead to Gendercide. Compare Straw Feminist, Straw Misogynist and Woman Scorned.
Hello, Unknown Troper. You'll need to get known to lend a hand here.