Entire essays could be written on this particular criteria. Suffice it to say, that a troll is often eager to project his own shortcomings upon others so his own will be less obvious. For instance, a troll is often found accusing its "opponents" of the things he himself is being accused of, often using the same phrasing. The troll does this so that a casual reader who isn't informed will see these labels in reference to not only the trolls actions, but also his opponents actions.