Classiest driver in OC

I have had my share of (figuratively speaking) run-ins with other drivers. It is usually I who is annoyed or outraged  by the way my fellow sharers of the road go about their daily commutes. Speedily zig zagging , sans use of turn signal , darting in and out of traffic, risking (our) life and limb in pursuit of one more car length, all while certain that the patch of asphalt in question is their personal possession. When cut off I have been known to honk or swear. However, I was taken by surprise today. I was driving in the second to fastest lane, and  although going 70 , I noticed that the traffic behind me was catching up, so I signaled and went to move to the right. Just before I changed lanes, a tall white  SUV passed me  on my right. As it passed, I saw, framed in the driver's window, a raised male forearm with extended middle finger.  I was truly surprised, as I really don't know what I did. He ( the arm looked male) wasn't the car that had been behind me, I waited for him to pass before, making  my lane change, so I don't know what the offense was. Maybe he felt I was holding up general progress. Hard to say. But  what is not hard to say, is that there not a shred of civility left on those roads. Lord save me from them.