There can be multiple levels of a dick move. Level one is something minor and insignificant (i.e: Like throwing someone's external HD into the bathtub). Level two is something like that asshole in charge of the Titanic who let it sink, and level three is on par with 9/11.
Some argue that the Holocaust was a Level 4 dick move, but others argue that is was just plain a shitty thing to do.
Other Guy: Yeah, that was a real dick move, that whole 9/11 thing was.