For fairness' sake:
Hate is, or at least used to be, a very strong word. Perhaps that's why it's been overused so much, but it used to denote a very strong emotion towards someone who had really wronged you or someone you loved. That this word has been so thinned out is a pet peeve of mine.
Here in Norway, it's the word "bullying". Bullying used to be the continuous bothering of another person, with acts such as saying mean things, pushing them in hallways, spreading rumours, yelling rude things to them across the common room, etc. Probably because it was such a powerful word, and no one wants to be known as a bully, people started abusing it on those who disagreed with them, and now you get called a bully if you so much as write an editorial telling someone how they happen to be wrong about something. It's incredibly irritating.
I know words change meaning over time, but it annoys me when they do so for backhanded emotional or political reasons.