Dropping a hint
Know how to correctly assess the character of others, judge behavior instead of intention. Be self-aware concerning those aspects of your own character that increase your vulnerability to manipulation. Recognize tactics of manipulation, such as persistent negative judgment and criticism; public berating; shaming or humiliation; hostile humor; sarcasm; negative surprises; peer pressure; social exclusion; silent treatment; threats to safety and security, fake closeness, insincere flattery, expecting disproportionate reciprocation for favors, abuse of all kinds, overt aggression. Change your behavior to improve your relationship with the manipulator. The more alert and tactful you are the better your chances to avoid losing battles.