Keep in mind it depends on the playthrough. While I'm glad it's there, I don't play the male content, so for me all Dylan really does is laze around playing video games, faps by himself and get beaten up by Aiden's gang. Ellie doesn't see him naked, doesn't add the viagra, he hasn't seen Sophia's boobs or her in a bikini. Except for maybe Carl, all other males come off as entitled, pervy pricks.
So for me it's perfectly reasonable for Ellie to hate Dylan. She feels safer with him not being around. It also depends on backstory we don't know yet. That's why pre-update I was more interested in character development. But it is good to see Dylan start to stand up for himself.
I'm intrigued to see if the Emma event depends on whether or not you accept Aiden's blackmail. Her and Julia are other timid characters I'd like to see come out of their shells, which may happen Day 18