I'm not talking about negative reviews with constructive criticism. People are entitled to opinions, and not everyone has to like every book they read.
I'm saying those reviews where people are so vicious that they clearly post it just to make someone hurt. The ones where people make new accounts to anonymously attack an author's work. Where these trolls collect in groups to harass people into not publishing a book, or to convince others to stay away from it.
This isn't just about authors though. There are bloggers targeted by street teams because they didn't post a 4 or 5 star review. They have rumors spread about them, ruining their reputation and making it so they don't want to deal with it anymore.
There is enough drama in the books we read, we don't need to bring it into the community.
Some easy ways to let authors and bloggers know you appreciate them it by:
-leaving them a comment on a social media site
-posting a review for a book you loved
-up voting and commenting on a review you enjoyed