Most people have emotional weaknesses. These provide vulnerabilities that can be used to control them. For example, for people who crave social acceptance, you can play up the camaraderie angle, and then threaten to withdraw your friendship if they don’t submit to your will. Or for people who are afraid of anger, you can demonstrate how upset you become when they ‘betray your trust’ (that is, don’t let you control them).
kickbully.com, “Workplace Bully as Master Manipulator”