Board Thread:The Flash discussions/@comment-5441128-20170524174933/@comment-24152851-20170730005457

They hate her for
 * 1) Having too much focus to the point she overshadows the main character Oliver.
 * 2) She's a hypocrite who always complains about Oliver keeping secrets yet she's fine with keeping secrets herself.
 * 3) Olicity and the endless relationship drama that comes with it (lose trust, break up, win back trust, stop seeing each other)
 * 4) Green Arrow and Black Canary is the canon couple, not Olicity
 * 5) Her increased focus means she keeps saving the day and Oliver becomes less badass.