Just keep loving him, you never know when they grow out of ther "phase" but teengers have a habit of growing up over time. So many don't think that their parents care about them, don't let yours be one of them. When my oldest boy was a teenager, he took the rap for a friend, paid his dues and kept his mouth shut...... years later when we talked about his problems he had growing up...... He told me he didn't do what he was accused of doing (that time) then he said that he knew that I would always love him no matter what, but the other kid would get kicked out and disowned for breaking the rules...... I have good kids :) And I did have to come down hard on him a time or two.... tough love we called it.
Moral of the story is..... let your son know he is loved, even when you want to pull your hair out and make a rope and tie him up with it. How you treat your son WILL make a difference in some point of his life.
Hang in there....they DO grow up! :)