To add another dynamic to the equation. I was strapping my kid into the carseat at home this morning, and I heard lots of honking and yelling so I checked it out. A lady in a truck was driving and was on the phone, a guy in a Scion X(whatever the toaster looking things are) gets close, starts rapping on his horn. By the time I saw it she wasn't even at the intersection yet, just she was on the phone. This all was in a neighborhood and occured under 10mph.
The douche in the scion stopps, starts honking and yelling out the window "F you you stupid Fing b**ch, get off the Fing phone and drive you piece of Sh.." peeled his tires speeding off in a residential neighborhood. He was also turning which even if she blew the stoplight wouldn't have affected him at all.
Granted I didn't see what happened and she was on the phone, but the guy was a total dick. Anyone ever witnessed the supposed anti-phone rage? I've been cussed at / swerved at simply for talking on the phone even though I did nothing wrong, just was on the phone. I don't think holding a rectangle up to your ear is deserving of people loosing their cool over if they're obeying traffic flow.
Disclaimer: I hate distracted cell phone drivers, they suck and cause all sorts of problems. People in la la land while doing anything other than driving are diserving of a few honks to wake them up.