We all have traits of every disorder, it is only when they become longstanding and pervasive patterns, not once in a great while moments.
The best key to all personality disorders is that these types employ compulsive lying, manipulation and game playing.
If you know someone that is consistently deceptive, overly reactive to the smallest of criticisms, never apologizes, plays games on a regular basis, takes no responsibility for how their behaviors effect others, lies about big and small stuff and, in general, makes you want to tear your hair out or shoot them, odds are good you are dealing with a personality disordered person. lol