My car was in the shop before Christmas. I had a Chevy Aveo rental

.
I was driving north on I-5 to go pick my real car up, and traffic was moving along reasonably well, with everyone able to do 60. I'm even able to pull back into the middle lane of 3 lanes when I'm not passing. Because I was in a POS Aveo, I really wasn't even driving fast or anything. Doing 62-64 in a 60mph zone. Everyone else was doing 60+.
Except this guy in a POS Hyundai driving 55 in the left lane of 3 lanes. Now, I'm in a POS Aveo, so I really don't have any room to snicker much at the POS Hyundai. Still, I had just pulled out into the left lane to see that he was going slower than everyone else up ahead. I was able to pass a car and get into the middle lane, still doing 62ish. As I pass by him, I look at him and just slowly shake my head. Didn't even flip him off. It was dark out, and I guess I'd be surprised if he really saw me...yet I guess he did.
I'm almost past him, when he speeds up to match then slighly exceed my speed. I mentally do a facepalm and look over at him again as he passes me. I shake my head again. I'm approaching the guy ahead of me, and know I'm going to need to pull in behind this guy, but as the POS Hyundai's rear bumper gets just past my front left tire, he cuts hard into my lane. About halfway into the lane. I'm a bit surprised by this, and manage to avoid him, but almost hit the guy to my right rear. I was able to just miss him and the POS Hyundai.
By this time, all the cars behind us have stood on their brakes, and a large gap of no cars opens up both behind and in front of us. The POS Hyundai continues in the left lane and starts going 55 again. I'm about 4-5 carlengths behind him at this point, and decide to pull into the left lane and put on my brights for about 5 seconds to make a point. The guy break checks me. When I'm 4-5 carlengths behind. Though I had only planned on keeping the brights on for a short while, I decided to keep them on a few seconds longer. I pull back into the middle lane when I'm done and continue driving normally. Of course, he's doing 55 and I'd like to do the speed limit. So I start speeding up.
At this poing, I remember I'm in a rental, but DAMN!!! I didn't get the insurance. So I really will need to avoid this guy and not pit maneuver him or something wonderful if he pulled that crap again.
So...when I'm about 2 carlengths behind him, he decides to try to run me off the road again....but I'm I pretty much see it coming...and easily avoid him. I get behind him and put on my brights again from about 5 carlengths back...and pretty much stay that way for a while. He pulls off the freeway.
What was weird about this is...I didn't do anything like flip him off. Just shook my head.