Haters are different from someone who simply doesn't like or enjoy something and moves on. They are different from someone who passes a positive or negative personal judgement on something.
Haters generally have few accomplishments themselves, especially related to what they are hating on. There can be endless speculation about what motivates haters, from personal issues to plain old sadistic tendencies. They generally represent the less intelligent and less educated.
Some want to confuse internet hacktivism with internet hate. Hacktivism requires skill and intelligence, while hate requires ignorance. Hacktivism sometimes targets an enemy. Juvenile hate targets someone who is not an enemy of anything, for no reason. The small-minded are easy to jump on a hate bandwagon. Mob mentality sometimes rules on the internet.
The haters are fundamentally unable to appreciate what they are seeing. Haters are, after all, very ignorant and prone to a herd mentality. Their scope of reality is narrow, limited by the dictates of mass media and groupthink.
Haters are similar to the proverbial cavemen who, if presented with a cell phone or a laptop computer, would end up smashing it because they don't understand it. It has odd sounds and lights. They have no way to appreciate it.
The truth is that Laura won at the YouTube game. She's had view counts rivaling top channels, had videos on featured pages, and not to mention made thousands of dollars. Right now there is a dim-witted punk sitting at his/her computer who just can't stand it. LOL