First off, let me say that I don't like to think that I 'hate' anything, hate is such a basic word that because of its simplicity, makes a bigger impact than more complex words, such as 'resent'. I resent things. I resent some people. But I don't hate. I'm not a hater, I like to think I'm above that.
But you know what ticks me off, annoys me to the bone? When people say they 'hate' something with no good reason, they hate a band, they hate some people, and yet they can't justify it. The people who I see do this most, especially towards people, are girls. Specifically, the friends of girls who have just gone through a breakup. Young couples break up, and you're never going to find true love at sweet 16, that's pretty much a fact nowadays, and a lot of the time couples will break up because it isn't working. That's fine, that's nothing to hate each other for. You may be upset (girls, I'm talking to you) but he was probably honest and decent about it and it'll work out better for the both of you in the long run, who knows, you could even end up being friends. But don't listen to your friends when they say that they 'hate' him for splitting up with you; that is not even a halfway decent excuse to hate someone. Like I said, if it wasn't working, then it was better to split up than keep at it, there would be more pain in the long run.
But what if the boy (lets face it, it's easier for me to write this from a girl's perspective, much love for the few lads who read this blog <3) had been a complete ass in the relationship, not putting any effort into making it work, dragging the girl along to be there when he pleased and not when she pleased? What if he had started physically or mentally abusing her, before getting fed up of her and then dumping her? That, my friends, is when it's Ok to hate someone, when they've been a complete and utter disgrace to their sex.
Remember, dumping someone by itself is not a bad thing. Treating someone like an object or toy or something without a real unique identity (just another girl friend/boy friend) is. Hate them for that.
Or, even better, resent them.