Tailgating's a traffic crime. Aggressive tailgating can, in many jurisdictions, become a "road rage" thing and an imprisonable offense. Caution. (Had an off-duty cop do all that to me, imagining his badge in the car gave him the right to prey upon others on the road. Almost crashed into oncoming traffic in an attempt to get around me, as well. Lovely guy, that one was.)
Of course, bashing another's car isn't kosher either, particularly if any damage was done (aside from your ego ... the effrontery of it all).
I figure: recording the scene and getting details down for police, if it's needed, can provide all the "pay-back" necessary for me to feel just fine. And it keeps me safer than being branded for retaliatory violent actions upon another.
JMO