WHY DO SOME PERSON HATE SASUKE UCHIWA

When Sasuke joined Madara, well, thats when the "hating " started.

I suppose its like how people reacted to Gaara when he was a bloodthirsty psycho killer. They forget who the real Sasuke is: a sweet decent kid who's willing to die for his friends.

No one had anything against Sasuke when he wanted to take down Itachi.

Sasuke is destroying everything Itachi has stood for. Thats why some people don't like him.

Probably because he betrayed Konoha (and now wants to kill every single person who lives there) , tried to kill his ex-comrades and comrades and so... Some people call him gay, Эмо and such (I don't think badly about these kinds of people)...
I don't really agree with Sasuke's Последнее actions (even though I don't even remember when he appeared last time in the Манга xD), I don't hate или dislike him... I just feel sorry for him... I hope he doesn't die and that he returns to his former self xD