I think its more perception is reality. This stuff happens to everyone and normally what we call immature and aggresive behavior is how those people respond to those things and get through them. How'd you deal with it? I know my mom.. and a couple of other people who would've beeped back, or cussed them out or even stepped out of their car to confront them.
Where as--We realize its stupid and avoid such interactions and acknowledge he practicality is that it'd be better off not happening in the first place.
I don't think anyone is specifically targeted, just when the above solutions are tried, people are either intimidated, realize they don't want to escalate the situation, or infact do escalate it.
But yeah, a lot of drivers in general are annoying.