I find that getting out my cell phone and taking a photo has a generally positive effect on the behavior of aggressive or obnoxious drivers. I try to keep the phone at my fingertips for this reason - even if I can't see their plates or get off a good shot, just seeing the phone in my hands and knowing that they are going on record makes most drivers shape up. Usually they can't get away from me fast enough. They know that what they are doing is wrong.

If it feels odd it probably is
I agree.