I personnally don't hate on characters and people; it is illogical.
Sasuke has a popular fanbase; characters with popular fanbases(Minato, Itachi, Naruto, Sasuke, also Hashirama, Madara, Nagato, hinata etc...) are tend to be crowded and filled with any kind of opinions; because of the numbers seemingly backing up; some can be referred as "fanboys" tand to be loud and "defend"(more likely overrate) their faves. That's it, best thing is trying to give sense, if not ignore. Any terrible fantards can be annoying it is not exclusive to a character.