Some people dislike Hillary Clinton because they claim her to have been involved in way too many dodgy activities in the past. Many people thin that she is responsible for the assassination of the American convoys sent to Libya in the year 2012. Apart from that, some people also consider her to be totally responsible for the death of Seth Rich.
Another reason why some people hate her is due to the fact that never for once, did she condemn Bill Clinton for all the allegations that he faced for sexual misconduct. This kind of reflects hypocrisy according to many people.