One- and two-star ratings, at least as far as Goodreads is concerned, aren't ratings which suggested hatred. Goodreads intends a two-star rating to be seen as 'meh' and a one-star rating to be seen as, quite neutrally, 'didn't like it'.

I'm somewhat choosy about what I read, and I can count on one hand the number of books I've read through which I've actively disliked, but even so my average rating on Goodreads is only just over three stars. I liked a number of books. I found a number of books suggested to me to illicit nothing more than 'meh' from me. I disliked a few. I loved a few.

Unless somebody has explained their rating system in their profile, I assume that they're following the Goodreads system, wherein even a two-star rating isn't all that negative.