I mean, if we wanna take that route, so has hannah, but the mc is obviously able to make things work with her.
Yes, hannah doesn't like her group, yes, we see her wanting to escape from Brian's clutches, but when at school, she is still passively apart of the same friend group that bullied Vicky and Lucy.
We don't see anything from Chloe's perspective bc she's not considered a main character, but if we ever did, I do get the feeling Chloe would be more against the bullying that her group is apart of than we would realize.
Obviously that's just my opinion, but all signs we have seen so far in the story haven pointed to her not really wanting to be apart of the massive hate group.
We also can't forget that the mc was able to accept and somewhat forgive Catherine, even though when Vicky was gone, and was fully on the MC's side, Catherine was the one who had the biggest role in the bullying on the train.
Catherine deserved way less forgiveness than someone like Chloe yet we do see her get it more, Chloe has more innocence on screen.