Fortunately, on our east side of the city, drivers aren't too aggressive.
If I'm honked at, it scares/startles me, but there isn't much I can do since they drive past me too fast.
I want to throw a rock or spark plug or something if they're being nasty, but they're long gone before I could react. I also pull further into the lane.
I worry that if I'm too much an a**hole people will take it out on other cyclists later. If they want to deal with me, okay, I'm ready.