How I would assess an aggressive driver situation:
1. Are they right on me?
2. Am I driving a reasonable speed (i.e. the flow of traffic or 5-9 over)?
3. Am I in the rightmost slow lane? If yes, fuck that guy behind me. I don't give a shit how much of a hurry he is in, I'm in the slow lane, I'm driving either at the speed limit or 5-9 over or with the flow of traffic. He can move over if he wants to go faster. I'm not catering to his ass because he's in a hurry. World doesn't revolve around him.
Then I play the game of positive reinforcement. The closer they get on me, the slower I go. The farther they go, the more I speed up. It's funny to see them get so pissed off and angry in the mirror
If the answer is no, and I don't want to go as fast as him, then I move over when I can or I speed up to move over. If it's a one-lane road, I'll go up to 9 over but no more than that (don't have a radar detector and not interested in risking a ticket). If he signals to pass me, I'll slow down so he can pass me. Or I'll pull over depending upon how long the one-lane road is/if you can pass at all.