I’m glad you don’t hate Erina. Everyone seems to hate her because of her being antagonistic towards Soma, which in my opinion isn’t even as bad as they make it out to be.

Like, she was clearly set up to be a rival/motivation for him from the very beginning. The one shot is literally entirely about that rivalry. She’s not meant to be super friendly and supportive from the get go (which is a role that was later filled by the Polar Star dorm). 

Besides, based on what I’ve read about later in the story, Soma and Erina’s relationship becomes a lot less antagonistic and evolves into a much more friendly rivalry (more similar to the one between Soma and Takumi, but without one of them being an awkward nerd)