What is a dick
Dickish behavior is a value call. There has to be an action, it has to impact others in a negative way, and it has to be a situation in which survival is not in question.
Climbing over others to get out of a burning plane, not dickish. Not encouraged, but not dickish. Being at the front of the line, chewing up precious minutes while trying to fit your oversized suitcase through the emergency hatch... that is dickish.
Dickish comes in degrees, and is not absolute. Situation and context are everything. What is "meh" in one case, can be perfectly dickish in others. And what is dickish in the general case may wash out in the details under certain situations.
So, some examples of dickish behavior: