Dylan blaming the girl

Does anyone else think it’s completely unfair of Dylan to be blaming Kat, Nora and Swann for Kat collapsing? I think it’s really unfair because she spent the entire week that they met one another doing nothing, but being bigoted to Kat’s friends which led to her sister having to defend them and she let Corey harass the girls (especially Kat cause he was calling her a bitch/ and crossing her boundaries). And she had the information that Kat has cancer while the girls didn’t and yet she’s trying to claim that they’re responsible when she was constantly stressing Kat out. I get that she’s hurt because she doesn’t know if Kat will live or die, but I think this behavior is terrible. Honestly when you think about it would the concert have even happened had Corey and Dylan just let them exist and act like teens.