I know I've used the term myself but I'm getting tired of the word "hater" in online discussions. There are people who are filled with rage and anger and, yes, hate — but the way I usually see the word used these days is like this: Person A makes a valid criticism of someone or something…and Person B who doesn't like that criticism doesn't acknowledge it or rebut it. He just calls Person A a "hater." He's trying to say that the criticism is not valid. It's just the ranting of someone who's emotionally disturbed or working a sick, hidden agenda or something.
And sometimes, that might be true but too often lately it's just a way of knocking over the chess board because you're losing. It's like "All those people saying Trump lies…they're just haters." Often, they add, "haters gonna hate" or some little slogan like that but it's still just a way to delegitimize what might be a valid point. I think that's fighting dirty and if you don't…well, that could only be because you're a hater.