I'm surprised Maki didn't feel any sort of connection to Arae, given he was also kind of a loner when the series started. Jumping straight to calling her behavior toward Yuu "mean" when it read as curt and disinterested more than anything felt kind of out-of-character for him, in that sense. Like, all of the group are taking rumors and hearsay about Arae and making their judgments off of that, and I'd expect better, given all of them have dealt with "high school gossip/drama" before in this series, and so this weird shift in them falling for it when it comes to a new "outsider" character reads as kinda contrived.
I just hope Arae gets actual character-writing for her, and isn't treated as a plot device for whatever's going on with Yuu.