My philosophy on this:
1) Stay away from asshole drivers.
2) The moment you retaliate, you're one too.
3) This is CO, anybody could be packing heat - so let it go.
1) Plenty of people have done douchy moves by me. I've had people brake check me, try to run me off the road, even had one guy try to beat me/my car with a baseball bat. Sometimes you just can't get away from them immediately, but I've never been able to lose someone eventually.
2) Speeding up to "make them pay" or "give them a taste of their own medicine" or anything of that ilk makes you just as bad, if you do any of that stuff.
3) In CO your car is legally an extension of your home, and you can therefore legally carry any firearm you legally own in your car without a CCW permit. You never know just which drivers are packing, so it's best to just follow rule #1.