That sucks kiddo, get some wax/compound and gently try to buff it out, egg can sometimes eat into paint if left too long.
Keep your chin up, last week some 19 year old kid lost control of his car and totaled mine out. I had to go get another car, and some a*shole hits the bumper while I'm in the pizza place and drove off, so I now have $200 to lay out if I want to respray the bumper. People are stupid, they don't think, and thier parents don't teach them respect.
The only thing to do in your case is to ignore it, but if you happen to catch them, feel free to beat the living crap out of them. I'm with ya in spirit.