Originally Posted by Abdul Fattah

The reason why not to hate the sinner, and only the sin:
First of all; one shouldn't hate something/someone when it is not for the sake of Allah (subhana wa ta'ala). Secondly, we know that Allah (subhana wa ta'ala) hates sin, but he doesn't hate every person that has committed a sin (if not he would hate everybody). And since we cannot judge a person, we don't know who is hated by Allah (subhana wa ta'ala). In fact in many hadeeth the prophet (peace be upon him) told us about people that were considered sinners by society, but in the end will be forgiven by Allah (subhana wa ta'ala). So when you hate a sinner, it could be that you hate someone who is loved by Allah subhana wa ta'ala.