People use the word hate a lot, huge understatement there but a lot more than "dislike." But when I use the tend to use the word apparently inappropriately, some people I know claim I don't really understand the weight of claiming you hate someone.
Like take this example, there's a particular person I really hate online but don't know personally, to where I casually claim I wish he even died often. It seemingly holds no merit to anyone else because I don't know this person personally or have spoken to him. He simply annoys me with his general behavior on social media, and that's the basis for why I "hate" him.
I think it makes no sense because that would mean you can't truly hate someone like, say, Osama Bin Laden even if his acts of terrorism did not affect YOU. He is (was) evil, so wouldn't that be enough justification?