Get hold of Person A's sunglasses or other similar accessory.
Draw a pentacle on some hard, flat surface.
Spit in each angle, naming his crimes.
Smash the heck out of the sunglasses, telling him that he can no longer keep up his "front."
Toss out the sunglasses in fire or water, telling them that his "cool" will drift or melt away.
A friend of mine did this to his ex, and shortly thereafter her whole social world began to crumble.