Alright, at first I thought it was pathetic that he had fallen in love with a Vtuber, but now I'm beginning to understand him.
He spent his entire childhood being bullied by three girls he thought were guys, embarrassed to have been protected by an older boy he thought was a girl, and when he moved out he was treated as a weirdo because of how much effort he put into everything he did.
Then he finds out a streamer that makes he feel like he's not alone in the world and shows other weirdos who are just as passionate and determined as he is are out there, and she's fun to watch to boot. At such an impressionable age and given how much beating he took as a child, it makes sense he would fall for her even without having ever met.
But yeah, it is so good seeing the girls suffer like that. They honestly deserve it after everything they did to him and now think they can win him over without first patching things up.