I hear you - skateboarders skating on the street can be a nuisance sometimes, and yes they make a racket - but that's precisely why skate parks are such a great addition to a community.
That said, calling skateboarding an anti-social hobby is a bit misleading; on the contrary it's a highly social hobby, and in many ways can be socially uplifting.
In the part of town where I grew up, skateboarding gave my friends and I something enjoyable to do, that kept us fit - and crucially - kept us away from other more destructive past-times typically associated with rebellious teenagers (drinking, drugs etc.).
I don't mean to pick a fight here. Just felt it was necessary to better represent skateboarding culture (as a past skateboarder, who owes some of his success to the benefits that hobby provided at a very critical time in my life).