I tend to drive fast most of the time, but I never get in anyone's shit about it if they aren't. I've learned that if something happens and you were the one speeding, it's going to be your fault so it's just not worth getting pissed if other people aren't going as fast as you when you're breaking the limit. Case in point: I used to live up a hill from a main drag in Doylestown, PA. I once pulled out of my apartment and started to go down the hill. Now, I am not in a hurry or anything, but rolling down the hill, I just happened to go above the 25 mph speed limit - you know, because it was a hill. This other car comes along and does a half-second stop at a stop sign and decides to hurry up before I get there (I had no stop.) So he misjudges my speed and we collide. I was going maybe 29 in a 25. He was going less than 25 because he had just started. The cop did all the measuring and determined I was above the limit and said it was my fault. I tried to protest and he told me to save my breath - if he didn't declare it that way, the other guy's insurance would have an expert review it and I'd definitely lose because I was above the limit. So speeding is a gamble either way, which I'm fine with but I'm not going to be a dick about it to someone deciding not to take that gamble.
Another incident I once had is perhaps an even better example why being aggressive driver is not a good idea. When I was in college, I used to work as a bartender on the weekends at a restaurant in Eatontown. A buddy of mine at school worked there with me and I used to drive us down after my last class. It was usually tight because my last class would end at around noon and my shift started around 3 for happy hour prep. So I'd have to get all my shit together, pick him up at his dorm and then get him to his place (which was a few miles from the restaurant) before heading to work myself. So I used to drive pretty fast down the Turnpike and Parkway. One such Friday, I'm doing about 85 (terminal speed for my '81 K-car) and look in my rearview and there is a car so close up my ass I can't even tell what kind of car it is. So I do what any self-respecting smart ass would do - I tap my brakes. Wrong move. It was a cop in an unmarked car. Actually, it was a 'roided up state trooper who was so angry when he came up to my window that I was pretty sure he was going to rip my front door off. Seriously, this guy was purple with rage. He starts screaming at me and doesn't stop for like five minutes. Then he demands my license and registration and says, "You better hope there's no problem with these." Then he stomps back to his car and leaves me and my buddy sitting there for like 20 minutes. My buddy and I are afraid to move - we just stare straight ahead and he says (almost under his breath) "I don't think you're getting a warning." That cracks me up and I tell him to shut up because if I start laughing, we're both going to get our asses beat right there on the side of the Parkway. In the end, I got a ticket for going 30 over the limit (which put me right on the edge of too many points) and fine of something like $350 (which, for a college student in the 90's, was a wad.) And I just took the ticket and thanked the officer. I drove the rest of the way in the right lane doing about 45. So, yeah, my little "tap the brakes" stunt really showed him, didn't it? But you know, every time I've thought of that cop since then, I wonder WHEN he died of a massive rage-induced heart attack not IF he died of a massive rage-induced heart attack. To this day, I think that is the angriest I've ever seen another human being.