Female Nijisanji fans are attacking the new Nijisanji girl because she collabed with her male genmates. The only female Nijis that they don't attack are the lesbians, the ones that are confirmed that their roommates have a boyfriend, and the 'approved' ones, the ones that they can use to self-insert into. You can go to a website called 好き嫌い.com if you want to see these 'people' in their natural habitat. This shit is absolutely horrible, even people from 5ch are disgusted by their behavior.
Now that this happen, I can say for certain that Nijisanji was a mistake and male vtubers were a mistake.