Why people hate Ginny?

Well, I can't answer it clearly enough because I don't hate her anymore. But I used to, so I'll try to explain.
So, the reason I hated Ginny so much was that she just popped in as Harry's new, great love, although no one predicted her to do so. Everyone knew she liked Harry, but after the Prisoner of Azkaban, everyone stopped believing in that...
And then,all of the sudden she comes in and Harry has these big feelings for her. I just didn't like the idea of Harry being with a half-explained character.
But I hated her more because she was just so cold to him, showing no emotions except like sisterly feelings...
I dunno, I like her now because her character has developed in the last two books, and I liked her especially in the last books because she was really brave and strong....
Besides, you gotta love J.K.'s characters. It's hard to hate them...At least to me!

i don't know why but i just hate her there is no reason for her to be there she just comes in being a cow and harry like i love u i wanted harry to get off with Hermione

Well, I'm not a huge fan of Ginny, I'll admit. I don't like that she just like, showed up and Harry was instantly in love with her in HBP. I prefer Ron/Hermione to Harry/Ginny because R/Hr had a history. Their relationship was built on seven years of friendship. While Harry and Ginny... well, she liked him until like, Goblet of Fire, and he saved her from the Basilsk, but that was the only basis of their coupledom. I just don't like how JKR shoved the two on us. Otherwise, I think she's funny and nice.

i dont see whats wrong with her. she could find someone better than harry though lol

It's probably because she just kinda popped out of nowhere in the sixth book and became Harry's girlfriend. Like, he never liked her particularly before and then suddenly theres some beast in Harry's chest that longs for her. I think people expected Harry's partner to be someone who was with him right from the start and who he had always liked. This annoys some people and causes them to dislike Ginny.

i hate ginny because is with my man

hi i didn't understand that ether in my school every girl hates ginny except me i think she is fabiolouse and very lucky but then i desided to make a survey and they all told me that they hate her becaue she kisses harry and she gets married to him and has kids with him but i dont think thats a good reasin why they should hate her....

...she is great and all of her fans think so she is very lucky and i am jelause because of that but thats no reson to hate her.....

Ginny Weasley is a character which was really under- developed in the films, but J.K.Rowling created a very colourful charcater with an interesting personality.
Some don't like her because of her relationship and eventual marriage with Harry, because of their OTPs. However, Harry needed someone who would make him laugh, rather than worry about him and fill his head with serious thoughts.
Some may be jealous of her because they believe to be a representation of the 'perfect' girl who gets the hero. This, however, is a misinterpretation, because Ginny is an athletic girl who slowly grows popular, and her character grows with her. One of her faults is obvious, because how else could the diary have wheedled it's way into her thoughts? Harry and all the characters have faults, which some people may glaze over or emphasize simply because she and Harry fell in love.
Ginny is interesting, and I, personally, was irritated when the films glossed over Ginny's entire personality.