The senior scholar Rabee bin Hadi al-Madkhali, hafidhahullaah, said:
If your brother makes a mistake, advise him with gentleness and present him proofs and evidences through which Allaah will benefit him.
As for sitting waiting in ambush for someone to make a mistake and to rouse up hatred here and there that so-and-so did such-and-such. These are the ways of the Shayateen not the way of the people of the truth.
Source: Bahjatul Qaaree, p.107
Courtesy of Miraath al-Anbiyya