This dude is entertaining enough. I don't get Pippa unicorns because she flat out says " I AM YOUR SISTER, I AM NOT GFE". The fact Pippa is an unironic Unicorn herself just drives it home: she knows what it's all about, it's not a misunderstanding. It's not any kind of virtue grab, she just isn't GFE and (AFAIK) has never done anything related to GFE. I get not liking particular male streamers (or any streamer) but most these guys are okay.
As for why she's done so many male collabs, I think these guys are likely much less intimidating to Pippa (then some female Vtubers) and they are probably more assertive about asking her for collabs, getting around Pippa's autism about responding to messages.