I have no problems with letting ppl pass me with in reason, but if i see them trying to do it in a stupid point in time like on a blind corner, or if there tailgaiting me, ill piss them off to teach them a lesson. (such as speed up).
My favourite tactic for the arsehole drivers out there on passing lanes is i speed up to be level with another car in the left hand lane and sit there, so the dickhead behind me cant get past, then just as the lanes merge, drop a gear and take off, leaving him behind the slower vehicle.
Did this to a car not so long ago that thought it was a good idea to try and see what was up my exhaust pipe (he was that close behind me i couldnt see his headlights!).
that teaches them a lesson, but i have had it backfire once and had the person stalk me when they got an opportunity to pass the car in front of them.
...thank god he was in a shitter, and i could outdo him on the twisty bits, lost him completely