I will admit that I am pretty quick to shout heads up and escalate the verbal stakes (e.g. cursing) when motorists honk if I (for example) legally and quickly take the full lane, but I only do so in the interest of encouraging safer driving and cycling. I have zero interest in provoking a fight.
"Quickly?" In other words, you're riding along the right hand side of your lane, and as a car approaches intending to pass you, you quickly move into the middle or left of the lane to force them to quickly slow down to prevent passing. Doing anything "quickly" that obstructs others is a dick move and you know it. You're an asshole who makes the rest of us cyclists look bad. Only in very rare situations would that "quickly" move promote safety. It's unsafe to anger another driver, both to you and the next cyclist they come upon. You're not doing it to promote safety, you're doing it to express dominance, like a gorilla beating its chest.
Next time you try that, think about this - are you doing it to promote safety, or are you doing it to try to express dominance by proving that you can legally be a dick? Believe me, the other driver doesn't care how big your penis is, so be the better person and don't be a dick or a dumbass to cars when you're on your bike, you're making the rest of us look bad, and it hurts us when we actually want to promote safety or policy changes (who wants their tax dollars to pay for bike lanes for a bunch of assholes like you?)
What's with your attitude? As far as anyone can tell, you're the asshole for all your presumption.
In any case, I do signal before moving from the edge of a lane to the middle, and I do assess if it's OK to do so.
Also, where I live (California), drivers may only pass when there is three or more feet between a cyclist and a driver.
Why don't you take your sanctimoniousness someplace where it's warranted?