If someone walks up to you and says "you're a fucking loser" and laughs like it's just a joke, most people would either curse back or laugh along to hide the pain. That is a fatal mistake because either way you just gave them the power. Here is a dark psychology trick to destroy them without raising your voice. Don't flinch. Don't even blink. Let their words die in the air for 3 seconds. Now look them dead in the eye and say, "Say that again but slower.