Kurt Hummel really hates Jeff Sterling. He fucking hates his guts and wishes the bottle blond would be out of his life once and for all. He just wants him gone, because the only thing that keeps him from punching him in the face is that Kurt's boyfriend, Nick, is Jeff's best friend and he doubts that Nick would be pleased.
He hates that Jeff stole Blaine from him, thinking that he was a boyfriend stealer, when in reality, Blaine had broken up with Jeff for Kurt not long after they met at Dalton that one day, even if he did think that Kurt had no interest in him.
He hates his stupid fucking face and the way there's always a smile on it, no matter what the hell happened to him. Like, really, do you ever experience a bad day, you little shit? Stop being so happy.
He hates the way that everybody loves him and that he makes friends so easily. He hates how at ease he is in nearly any situation and that he has no shame. Why couldn't he embarrass himself for once in his life?
He hates the way that Nick and Blaine would rather pick Jeff over Kurt any day. Kurt is a man who likes the attention on him and the fact that some beach blond little douchebag gets the attention that should be his makes him want to vomit.
He hates the way that Jeff is there for others at the slightest hint of something being wrong, no matter what situation. Jeff's the type of person that would drive out at three am when he had to be up early just to comfort someone, which he insists only worked in person.
He hates the way that on the slight chance that something is wrong, Jeff turns to drugs and alcohol, which are often the causes of the problem. He hates that he'd rather turn to those things and run away from his problems than, God forbid, try to talk to anyone about them.
But most of all, he hates the way that he can't seem to resist Jeff, no matter how much he wants to. He hates the way that most nights are spent sneaking out of their dorms to exchange kisses that their boyfriends would never find out about. He hates that Jeff loves Blaine too much to break up with him so he and Kurt could be together.
So really, it is the things about Jeff that makes Kurt love him so much.