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Outside of Reddit and Twitter falseflagging as /vt/ unicorns saying that merely collabing with a male taints a female vtuber, it's clear that it's more about the attitude towards the fans.
Mumei collabed with a male, but did not sever her attention to her viewers and make them the third guy in the room. Kronii did.
Instead of abhorring male collabs, I suggest we view them as opportunities for our oshis to prove themselves: Do they make the viewers or the collab partner the third guy in the room?