Do not despise anyone no matter how bad a condition he may be in, even though he may be an adulterer or drunkard. Despise the actions of the disobedient; not their persons. It is compulsory to hate the disbelief of the disbelievers and the transgression of the sinners. Hate the act, not the doer of the act. Hadhrat Thanwi (Rahimahullah) said that this is very easy. This is similar to a situation where a prince whose face is radiant comes with ink all over his face. Will you despise the prince or his act of applying the ink. You will not hate the prince because you know that he is a prince. You don’t know when he will wash his face and make it radiant once again. From this you can understand that one should hate the act and not the doer of the act. Perhaps he may repent and become a waliullah. However, when you see someone committing a sin, supplicate to Allah to protect you from that sin. And express gratitude to Allah for not involving you in that sin by reading the du'a

If perchance you saw someone staring at a woman, then protect your gaze and thank Allah for protecting you from this spiritual malady.