I get where you're coming from, I think it can be reasonable that some people would prefer watching either a cute girls doing cute things stream or a bros being bros stream without the two worlds colliding, and even if most discussion of it is bait I understand why the unplanned NijiEN call-ins could rub someone the wrong way, but even then it feels like an unreasonable sense of entitlement to demand that mixed-sex collaborations never happen.
I hate that unicorns have such a strong presence in the community that they put unreasonable pressure on streamers just by existing. It feels like any female vtuber who's gone a few months without male collabs ends up in a position where they're condemned to never working with a penis-haver in case their audience revolt, even if they've never made any attempt to court a GFE-type audience - and while it's easy to suggest doing it anyway to filter them, a lot of these people aren't mentally equipped to deal with threads, tweets, and drive-by stream chatters calling them a whore and spreading rumours about them for years on end.