I feel your pain my friend. I have neighbors that stare at me when I wash my car, probably because its in the 30's and I have a heavy coat on, rubber gloves and a stocking cap and know what, my wife told me some of them laugh at me because I clean my car so much. So much is once a week and it takes me an hour and a half. They can kiss my ***!
Your situation sounds a bit more militant, ignore her and yell at the brat any time you get a chance that'll scare him away. I got one across the street from me, caught him in my garage with his scooter, he'll never come near my house. Now some of you may be saying shouldn't you be nice and talk to the kid and the parent? Been there, done that, they don't listen, don't care, and I think most of all they'd love to see you driving a trashed mini van or suv just like them. Jealous a holes my friend.

Pat