Here's my OB question after all this fricking typing: Should I feel bad about this jackass?
I wouldn't. You took a picture of his vehicle in a public place. Heck, it is 2013 - you should have told him his vehicle was already photographed 37 times that day, statistically by banks and other security cameras around - at least you were man enough to do it where he could see you.
F*ck that self-important a$$.