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In Rushia's case yeah she got a DM on Discord from a guy in public during a stream, the problem wasn't just this, the problem was this guy is also a very famous Utaite who was rumored to have been living with her in around 2018 or so and his message was "I'm done recording, I'm returning home Mii-chan" which could be interpreted as him returning to their shared home and to boot "Mii-chan" is a very intimate way to refer to her. This guy has a fanbase full of yumejo/fujoshi tripling hers during her peak and whose most obsessive fans were very upset that he appeared to be intimate with her despite him saying he was bad with women and had no female friendships. Backlash in this case came from all over the place but Rushia's fans were not at the heart of it, most were depressed but no big names seemed to want to strike back at her. Vtuber haters harassed her, fans of Jun (a famous JP youtuber who hates vtubers) piled on to harass her, her old antis piled on to harass her, Nijisanji tribalists piled on to harass her, and of course the utaite's fans also went after her.