Me too. I'd much rather be honked at then hold up traffic and be an ass. But I'm a pretty good "heads up" driver and with a manual both hands have to be on my car to make it go. So that's seldom a problem.
That said, I usually don't honk if I can just go around people who aren't driving/paying attention. Usually that's fine but sometimes people want to rage over it. Like they had a right to hold up traffic and I just ruined it for them.