She’s egotistical, a liar, she humiliated all of Twilight’s friends, tried to use an evil artifact for petty revenge, (unaware of it corrupting her to the point of enslaving a town) among other things.
If she wasn’t such a cute pony, everyone would hate her.
Well, this has created a tag war. I bet the mods love those. I love how a mod removed a tag, yet it was put back automatically, if “System” means what I think it does.