Why is Ivy Mayfair-Richards so hated?

Don’t get me wrong, I know she made some terrible calls and betrayed Ally! But in a show full of villains and assholes, why is Ivy enemy No. 1?

Don’t get me wrong, I know she made some terrible calls and betrayed Ally! But in a show full of villains and assholes, why is Ivy enemy No. 1?