I don't think Hate is the right word. The fans of this series dislike Ging due to his negligence towards raising Gon in the first place. It comes down to a matter of perspective. Some understand Ging's situation, accepting that he alone couldn't raise a child on his own. While others don't accept that and believe he should have taken responsibility for his child and should not have left him with aunt Mito. I personally think that he made the right decision. After separating from his wife, a carefree and slightly childish man like him couldn't have raised Gon properly. Besides, after the Hunter Election Arc, Ging now seems to keep in touch with Gon over the phone, so he's finally trying to fulfill his role as the father figure. I believe that must count for something.