The most famous forms of Holocaust denial and revisionism tend to focus on Jews, casting doubt, for example, on how many were exterminated in the camps. But denying the impact the Nazis had on the other groups they targeted, including queer and trans people, disabled people and Romani people, is still Holocaust denial. Maybe someone should tell J.K. Rowling.
Trans-exclusionary radical feminists (TERFs) are a thing. I’m not sure why but it is. There are many. From what I’ve seen it’s mainly women who are SO heavily misandrist and hateful of men they think any trans woman is still a man and therefore out to rape and kill them by design, but I haven’t looked that deep into the bigotry.