As far as possible, a Salik should not harm others and should behave well with even bad people.  A human being should attend to one's state (Haal) first and should believe that all others are better than him (or her) and he himself is the worst among all.  To pay attention to other's sins and talk about them in one's assemblies is against the path of the Sufiya

Anecdote: A sinner would complain about Hadhrat Khwaja Baqibillah (May Allah Ta’ala shower His Mercy on him) all the time.  He would use such words that the listeners could not bear it and would get angry.  But they would be forced to be patient.

Once, an attendant of the Khwaja could not bear it any longer and he complained to the ruler of the area and got him arrested.  When this news reached the Khwaja, he called his attendant and said: Why did you get my neighbor arrested?

 

With proper respect, the attendant said that this person would use insulting words for you.  The Khwaja said: Who am I and what is my honor?  Whatever that person said about me, I am a worse sinner than that. I do not find anyone as worse as me.  We walk on the footsteps of the Sufiya and follow them.  It should be among our duties not to hurt anybody as far as possible; to behave well even with those who are bad.

We will be true, we will bear injustices and we will be happy,
It is disbelief in our path to be sad about injustices.

The Khwaja explained this to the disciple so beautifully that he was convinced and he went back to the ruler and got him released.  The result of this was that, that person repented from insulting and hurting the Khwaja.